This is our forum for discussion of the psychology topics we are learning. I will ask you to read a section of the text book or to view a web site or another resource and you will post your comments here. Always respond to at least two posts made by your classmates. Be sure to sign your comment or you will not receive a grade.
Monday, September 22, 2008
Nature and Nurture
How do you explain the fact that twins separated at birth often have a phenomenal number of things in common as adults?
32 comments:
Anonymous
said...
They will obviously look the same, but I think that for the other things such as what they like, their identical genes predispose them to like certain things more than others.
For example, twins that have an alcoholic gene might both become alcoholics whenever they drink the first time. However, if only one twin drinks, while the other has never dranken beer, then one will be an alcoholic and the other won't be; a difference due to their experiences.
In the previous post I wrote that genetics didn't really have much of an influence on us. But that was before reading the textbook. After reading it, it started making me wonder whether I was wrong. Like Brian, I do believe that alcoholism is in the genes, as has been shown in many studies. Of course, whether two twins become an alcoholic does depend on his or her choices. But genetics does influence their tolerance to alcohol, and hence, affects the level of their alcohol consumption, and how easily they become addicted. In the studies shown on pg. 99-100 of the textbook, it becomes quiet astonishing that separated twins like the two Jim Springers, and Oskar Stohr and Jack Yufe, made such similar choices in life. Like their occupation, behavior, etc. However, perhaps this data is merely a coincidence. In the past, the twins that I have known are almost polar opposites of each other in their characteristics and behaviors. Hence, I think that to a certain extent, the gene pools of the separated twins did, to an extent, have an influence in their choices and decisions. However, I believe that the genes play a very minor part in their personality and choices, as such things could be heavily influenced by the person's surroundings- family, friends, etc- and the physical environment in which they grew up in. SIRADA C. PS. can't refer to 2 posts, because there's only 1 before me...
The gens. In Identical Twins 100% of the gens are shared; the same "code" for two persons. We can easily anticipate that identical twin brothers will have a lot of common aspects because of the genetic predisposition, that is the same. The same occurs with Fraternal Twins, but the shared genes percentage is less, 50%. What differs one sibling another is the environment; how they interact with it and the experiences through their lives; like the example about alcohol that Brian gave us. I agree with Sarada when she says that the genes have an influence in choices and decisions but they just play a minor part on it.
Just as what I've said Nurture is more important for shaping one's personality. Even though twins mostly look the same and their body act the same (generically) but their personality do not act the same. Base on the environment or the out factor's effect, twins may have absolutely different ways of viewing an event. For instance, a friend of mine was in the badminton team when i was in grade six. she has a twin sister who looked absolutely like her, however one is in the badminton team and one is in the school band. They received different scores on their grade, because my friend enjoys to study but not her sister. This example has proved that one's personality has nothing to do with the generic facts but the out factors and the environment.
Twins separated at birth often have a phenomenal number of things in common as adults. Identical twins, share the same set of genes. They will be influenced by nurture are they develop in very similar ways because they will usually grow up in the same family/environment. Fraternal twins on the other hand, develop from separate fertilized eggs thus are not usually similar after birth. I can totally agree on this because I am a fraternal twin. My brother and I share NO common interests whatsoever and have dissimilar personalities. I agree with Brian with the alcoholic gene example. It all depends on their choices that they make which are overall depended upon their experiences.
From reading the text book, and reading about all the examples of identical twins separated at birth who later discovered each other and all the many things they had in common, it has to be obvious that genetics play a major role in how a person ends up (in terms of personalities and choices they make). What other explanantion is there for having so much in common? Yes, there is always coincidence, but the book clearly pointed out numerous examples of identical twins having many things in common. I slightly disagree with sirada when she states that genes play a very minor part in personalities and choices because i think that people only have control over themselves to a certain point. Yes, one can makes decisions and choices for themselves, but their genetic make-up will influence the choices that they do make. Here is another possible way to look at it. Take swimming for example. Butterfly, one of the four strokes in swimming, the one that many think of as being really difficult, has a certain way, a certain technique to it that must be followed, or else it cannot be considered as the stroke butterfly. however, people can go at different speeds in this stroke. Depending on their coaches and their determination, some will go faster than others in the stroke, yet in the end, there is only one way of doing the stroke. The stroke, in a sense, can be seen as the genes and the twins, and they coaches and determination can be seen as the different environments that the twins grow up in. when brian talked about alcoholism and how both twins may have a gene for alcoholism, he was right in saying that the gene determines the outcome of the twins when they drink, yet the twins have the choice to either drink or not drink, and this influences whether or not he/she will become an alcoholic.
It interesting that twins who are separated at both have so many things in common when they get older. This really shows the genetic side of who we are, especially if they are identical twins. That means their genes are the same, which isn't so surprising as to why they have so much in common.
i agree with brian and ruby. Twins have the same genes which would immediately give them similar characteristics. If separated, i think the only effect nurture could have would be if they were raised in similar environments.
Genes do greatly influence the similar behavior and personalities of twins. As stated in the text about Jim Lewis and Jim Springer, it really supports that nurture plays a bigger role in shaping who we are. When I first read the story of the twins separated at birth, I thought it was all a coincidence but the chances of that were impossible when the similarities were stated.
As Brian made a comment on alcoholism as a gene, Sirada gave her input how genetics affects alcoholism to certain extent but it also does depends on tolerance, effects of consumption, and likelihood of addiction. Our genetics influence our own decisions and choices. Our decisions and choices thus lead to our experiences.
Twins separated at birth have things in common because they do have the same genes, causing them to have the same personalities. After all identical twins are genetically identical. Their genes influence their personality, as the book says. It's amazing seeing how twins being separated for over 38 years can still have the same traits. With doing studies with twins being separated, but still have the same personalities, intelligence, and many other similarities, it concludes that genes play a significant role in identical twins.
I agree with Brian and Sirada about twins that can become prone to alcoholism if it runs in their genes, but can steer away from not drinking, therefore, not risking the chance of being an alcoholic. Their experiences and choices also affect whether they become an alcoholic or not.
Like Fawn said, twins that are separated at birth are very similar, because they share the same genes and genes are important in shaping personalities. In the book, it was also mentioned that the adoption agencies tend to place separated twins in similar homes, so the environments that they grow up in are probably similar too.
I agree with ruby and brian. It is mainly linked to nurture. Since they are twins they will have a phenominal number of similarities, but yet i think it also depends on if they were raised in similar environments as well.
Basically i think the genetic code is what mostly determines who someone is so it seems normal that people living different lives but having the same genetic code can be very very similar. I was kind of surprised that their personalities and choices in life seemed to be so similar since that seems to be choices that would be based off values which are taught by parents and what not.
I guess i disagree with most people here (BRIAN, MARIANA)! nature is important!! bring it!
I agree with mariana a. Identical twins share the same genes, therefore they are obviously going to share the same traits, interests, hobbies, tastes, etc. when they are adults. Even if they are experiencing different environments, they are born with distinct traits that enable to share similar aspects. Basically, twins are the same person, split into 2. It would be interesting to read a case study in which a pair of identical twins were completely different...
The identical twins are almost 100 percent the same. So this would explain the nature part of the argument. Eventhough the twins are seperated they still have the same traits because of their genetic build.
The nurturing does influence the twins. Howver, i do not think that it has that great of an effect to the twin's trait
The main reason they are the same is that they share many of the same genes. Although I think the environment mostly shapes us, our genes must play some role. This is why twins share so many things in common; they have the same genes. I would disagree with Brian when he claims there is an "alcoholic gene" but feel there is something that may leave someone more likely to be an alcoholic. I would still argue that a caring environment could override any genetics that cause alcoholism. I do concede to Sirada's point; there clearly are things that genetics influence such as a preferred occupation or hobbies.
In many studies it has been observed that twins have similar personalities as babies whether they were together or seperated. But when they grow up they will naturally go their own way based on past experiences, intelligence, and personlity which is affected by nature and nurture.
I agree with Ruby about her and her brohter. I have some old friends who were twins, they both were tall and muscular, athletic, and not so smart. But they liked different sports, different kinds of girls, different food, music, and had complete opposite personalities. It made it easy to distinct who was who between them. They may get some traits and features from their genes, but they had different past enviromental experiences.
Well, obviously the genetics are identical in identical twins...so they will have the same types of instincts. Like erin, i disagree with the people that say that genes play a minor role in life decisions. It is the only theory that is actually supported. I dont see any other explanation for the twins making similar choices in life when they dont have any contact with each other. I believe the way that one twin would eventually differ from the other is if a life altering event drastically changed the way the twin's mind functioned. Alcohol is a good example, as brian said, because when a person decides to drink alcohol, it can sometimes become a long and life changing road.
i like peter's enthusiasm for the subject ;) hahaha
They will always have the same physical characteristics, but it is also true that genes influence personaility. Since the twins were separated, they didn't have the same childhood or lived in the same environment, yet, they still had the same interests and were similar people. This is because of the fact that genes influence personality.
I also agree with Fawn that twins are likely to be similar because of the inherited genes.I agree with Ruby, i think that They will be influenced by nurture because they will develop in smiliar ways, since they are raised in the same environment.
I would say that although the twins are very similar in their physical look and their personality. I would say that what can make them differ from one another is the environment and experiences that they have or is in. with this i really do agree with brians comment on the twins becoming alcoholics.
Since they are twins, their appearance, height, and weights are the same. I think their personalities can be also similar because separation makes no obstruction for them to keep having their inherited characteristics. Maybe they even behave more naturally and have similar personality, because separation doesn’t make the gap of brotherly social standing.
Since genes play a significant role in personality, identical twins who 100% shares the same genes will have numbers of things in common as adult. However, since environment can influence people to some extent, it is true that twins will have some differences in their personality.
As Brian says, if one twin drinks beer and other not, it will be expected that the twins will have a different reaction to alcohol.
I agree with fawn’s idea that the same gene they inherited from parents makes them to have the same personality even they are separated at birth. I was surprised when I understood how genes are important to shape each individual’s personality.
I disagree with the statement that the twins will be different from those experiances. The fact remains that IF the clean twin did drink, his genetics would dictate that he will become an alcoholic like his brother. The sober twin is a alcoholic, he just doesn't realize it yet. They are slaves to their genetics and they cannot escape that fact, hence they have similar traits as adults. However, not exactly the same, the twin that hadn't drunk the beer may become a CEO of a company and become extremely self-reliant and indepedent whereas the drunkard of a brother will become dependent and lazy. In this way the twins will become two seperate, but similar people.
as mariana stated, identical twins have 100% similar genes. I don't have friends or relatives who are identical twins, but I do believe that twins brought up apart from each other will develop many similar behavior patterns because of their genes. As I wrote in the other blog question, I could find many similarities between my brother and I even though we grew up in entirely different environments. However, I also with mariana that nurture can cause differences between identical twins. Brian's alcohol example shows that whether or not a twin becomes alcoholic depends on his/her exposure to alcohol.
It is true that family environment influences children's altitudes, values, manners, faith, and politics but their genes also have some strong effects on their personalities, which means that twins should have many things in common as adults. Also it is more likely that identical twins have these things more than fraternal twins because they share 100% of the genes while fraternal twins share only 50% of the genes.
As Nicha said, I do not agree that nurturing has great effects either because a child bears more similarities to their biological parents than to their adoptive parents by their traits and habis, and this explains that genes have more effects than environment.
I am still more into nurture side. Even though Fraternal twins may look the same, however, their characteristics may be an absolute different just like what Ruby mentioned. I personally think that the environment around them is what shaped their personalities, which is what like what Andrew said.
If identical twins grow up in a different environment, one live in a peaceful environment while one live in a chaostic one. You can conclude that their personal will change aftertime.
Well, one is that since they have the same dna, they have the same inborn reaction to their enviroments. If someone took two twins and put them in identical enviroments, they would get identical people. I'm not saying that they are in the same enviroment, that would be impossible. But the places they go are very similar. Even though they are seperated, they usually stay in the same culture, and go to somewhat similar families. Also I believe that there is a biasis when it come to these cases. People are looking for similarities between the two. I'm sure that there are twins out there who were seperated, and are completely different. After all, there are twins who grow up together who don't act the same at all. Also if someone spends enough time with the seperated twins, I'm sure that they would start to see the differences that weren't apparent on the surface.
I do agree with brian das that their identical genes make it more likely for them to be similar. Thus I disagree with what Andrew Lai said, genese do play an important part of what makes us who we are, and not just the enviroment.
Since twins separated at birth have had a chance living individually not knowing he/she has a twin, they would live perfectly normal lives, with their own personalities, interests, and ethical choices. But if compared to twins that have lived together ever since they were born, it makes a big difference in the way they see themselves because they can always strive to be 'different' from the other twin or be in competition with each other because they are actually see together and this causes family and friends to make huge comparisons to the twins.
I know some friends who are (fraternal) twins, and whenever people would compare them, for example, a common question would regard "why don't you both share/ or do (a particular activity)?" since people would expect them to act exactly the same in every single situation they faced. But in truth, the twins don't have a lot in common. They look slightly different- one is taller with a more feminine side, and the other twin is shorter and has a tomboy-ish side to her.
I totally agree with Sirada in her saying that genes play a very minor role in their development in personality and interests, since they are influenced by family, friends, and the environment which can change each twin's point of view towards certain matters.
I also agree with Brian's alcoholic gene theory because separated twins can live in totally different environments, which can greatly influence their desire or chance of drinking.
32 comments:
They will obviously look the same, but I think that for the other things such as what they like, their identical genes predispose them to like certain things more than others.
For example, twins that have an alcoholic gene might both become alcoholics whenever they drink the first time. However, if only one twin drinks, while the other has never dranken beer, then one will be an alcoholic and the other won't be; a difference due to their experiences.
In the previous post I wrote that genetics didn't really have much of an influence on us. But that was before reading the textbook. After reading it, it started making me wonder whether I was wrong. Like Brian, I do believe that alcoholism is in the genes, as has been shown in many studies. Of course, whether two twins become an alcoholic does depend on his or her choices. But genetics does influence their tolerance to alcohol, and hence, affects the level of their alcohol consumption, and how easily they become addicted. In the studies shown on pg. 99-100 of the textbook, it becomes quiet astonishing that separated twins like the two Jim Springers, and Oskar Stohr and Jack Yufe, made such similar choices in life. Like their occupation, behavior, etc. However, perhaps this data is merely a coincidence. In the past, the twins that I have known are almost polar opposites of each other in their characteristics and behaviors. Hence, I think that to a certain extent, the gene pools of the separated twins did, to an extent, have an influence in their choices and decisions. However, I believe that the genes play a very minor part in their personality and choices, as such things could be heavily influenced by the person's surroundings- family, friends, etc- and the physical environment in which they grew up in.
SIRADA C.
PS. can't refer to 2 posts, because there's only 1 before me...
The gens. In Identical Twins 100% of the gens are shared; the same "code" for two persons. We can easily anticipate that identical twin brothers will have a lot of common aspects because of the genetic predisposition, that is the same. The same occurs with Fraternal Twins, but the shared genes percentage is less, 50%.
What differs one sibling another is the environment; how they interact with it and the
experiences through their lives; like the example about alcohol that Brian gave us. I agree with Sarada when she says that the genes have an influence in choices and decisions but they just play a minor part on it.
Just as what I've said Nurture is more important for shaping one's personality. Even though twins mostly look the same and their body act the same (generically) but their personality do not act the same. Base on the environment or the out factor's effect, twins may have absolutely different ways of viewing an event. For instance, a friend of mine was in the badminton team when i was in grade six. she has a twin sister who looked absolutely like her, however one is in the badminton team and one is in the school band. They received different scores on their grade, because my friend enjoys to study but not her sister. This example has proved that one's personality has nothing to do with the generic facts but the out factors and the environment.
Twins separated at birth often have a phenomenal number of things in common as adults. Identical twins, share the same set of genes. They will be influenced by nurture are they develop in very similar ways because they will usually grow up in the same family/environment. Fraternal twins on the other hand, develop from separate fertilized eggs thus are not usually similar after birth. I can totally agree on this because I am a fraternal twin. My brother and I share NO common interests whatsoever and have dissimilar personalities. I agree with Brian with the alcoholic gene example. It all depends on their choices that they make which are overall depended upon their experiences.
From reading the text book, and reading about all the examples of identical twins separated at birth who later discovered each other and all the many things they had in common, it has to be obvious that genetics play a major role in how a person ends up (in terms of personalities and choices they make). What other explanantion is there for having so much in common? Yes, there is always coincidence, but the book clearly pointed out numerous examples of identical twins having many things in common. I slightly disagree with sirada when she states that genes play a very minor part in personalities and choices because i think that people only have control over themselves to a certain point. Yes, one can makes decisions and choices for themselves, but their genetic make-up will influence the choices that they do make. Here is another possible way to look at it. Take swimming for example. Butterfly, one of the four strokes in swimming, the one that many think of as being really difficult, has a certain way, a certain technique to it that must be followed, or else it cannot be considered as the stroke butterfly. however, people can go at different speeds in this stroke. Depending on their coaches and their determination, some will go faster than others in the stroke, yet in the end, there is only one way of doing the stroke. The stroke, in a sense, can be seen as the genes and the twins, and they coaches and determination can be seen as the different environments that the twins grow up in. when brian talked about alcoholism and how both twins may have a gene for alcoholism, he was right in saying that the gene determines the outcome of the twins when they drink, yet the twins have the choice to either drink or not drink, and this influences whether or not he/she will become an alcoholic.
It interesting that twins who are separated at both have so many things in common when they get older. This really shows the genetic side of who we are, especially if they are identical twins. That means their genes are the same, which isn't so surprising as to why they have so much in common.
Brian das's comment about the twins and becoming alcoholics is very interesting and I agree. The twins may be different according to experiences.
i agree with brian and ruby. Twins have the same genes which would immediately give them similar characteristics. If separated, i think the only effect nurture could have would be if they were raised in similar environments.
Genes do greatly influence the similar behavior and personalities of twins. As stated in the text about Jim Lewis and Jim Springer, it really supports that nurture plays a bigger role in shaping who we are. When I first read the story of the twins separated at birth, I thought it was all a coincidence but the chances of that were impossible when the similarities were stated.
As Brian made a comment on alcoholism as a gene, Sirada gave her input how genetics affects alcoholism to certain extent but it also does depends on tolerance, effects of consumption, and likelihood of addiction. Our genetics influence our own decisions and choices. Our decisions and choices thus lead to our experiences.
Jocelyn
Twins separated at birth have things in common because they do have the same genes, causing them to have the same personalities. After all identical twins are genetically identical. Their genes influence their personality, as the book says. It's amazing seeing how twins being separated for over 38 years can still have the same traits. With doing studies with twins being separated, but still have the same personalities, intelligence, and many other similarities, it concludes that genes play a significant role in identical twins.
I agree with Brian and Sirada about twins that can become prone to alcoholism if it runs in their genes, but can steer away from not drinking, therefore, not risking the chance of being an alcoholic. Their experiences and choices also affect whether they become an alcoholic or not.
Like Fawn said, twins that are separated at birth are very similar, because they share the same genes and genes are important in shaping personalities. In the book, it was also mentioned that the adoption agencies tend to place separated twins in similar homes, so the environments that they grow up in are probably similar too.
I agree with ruby and brian.
It is mainly linked to nurture. Since they are twins they will have a phenominal number of similarities, but yet i think it also depends on if they were raised in similar environments as well.
Basically i think the genetic code is what mostly determines who someone is so it seems normal that people living different lives but having the same genetic code can be very very similar. I was kind of surprised that their personalities and choices in life seemed to be so similar since that seems to be choices that would be based off values which are taught by parents and what not.
I guess i disagree with most people here (BRIAN, MARIANA)! nature is important!! bring it!
I agree with mariana a. Identical twins share the same genes, therefore they are obviously going to share the same traits, interests, hobbies, tastes, etc. when they are adults. Even if they are experiencing different environments, they are born with distinct traits that enable to share similar aspects. Basically, twins are the same person, split into 2.
It would be interesting to read a case study in which a pair of identical twins were completely different...
The identical twins are almost 100 percent the same. So this would explain the nature part of the argument. Eventhough the twins are seperated they still have the same traits because of their genetic build.
The nurturing does influence the twins. Howver, i do not think that it has that great of an effect to the twin's trait
The main reason they are the same is that they share many of the same genes. Although I think the environment mostly shapes us, our genes must play some role. This is why twins share so many things in common; they have the same genes. I would disagree with Brian when he claims there is an "alcoholic gene" but feel there is something that may leave someone more likely to be an alcoholic. I would still argue that a caring environment could override any genetics that cause alcoholism. I do concede to Sirada's point; there clearly are things that genetics influence such as a preferred occupation or hobbies.
In many studies it has been observed that twins have similar personalities as babies whether they were together or seperated. But when they grow up they will naturally go their own way based on past experiences, intelligence, and personlity which is affected by nature and nurture.
I agree with Ruby about her and her brohter. I have some old friends who were twins, they both were tall and muscular, athletic, and not so smart. But they liked different sports, different kinds of girls, different food, music, and had complete opposite personalities. It made it easy to distinct who was who between them. They may get some traits and features from their genes, but they had different past enviromental experiences.
Well, obviously the genetics are identical in identical twins...so they will have the same types of instincts. Like erin, i disagree with the people that say that genes play a minor role in life decisions. It is the only theory that is actually supported. I dont see any other explanation for the twins making similar choices in life when they dont have any contact with each other. I believe the way that one twin would eventually differ from the other is if a life altering event drastically changed the way the twin's mind functioned. Alcohol is a good example, as brian said, because when a person decides to drink alcohol, it can sometimes become a long and life changing road.
i like peter's enthusiasm for the subject ;) hahaha
They will always have the same physical characteristics, but it is also true that genes influence personaility. Since the twins were separated, they didn't have the same childhood or lived in the same environment, yet, they still had the same interests and were similar people. This is because of the fact that genes influence personality.
I also agree with Fawn that twins are likely to be similar because of the inherited genes.I agree with Ruby, i think that They will be influenced by nurture because they will develop in smiliar ways, since they are raised in the same environment.
I would say that although the twins are very similar in their physical look and their personality. I would say that what can make them differ from one another is the environment and experiences that they have or is in. with this i really do agree with brians comment on the twins becoming alcoholics.
Since they are twins, their appearance, height, and weights are the same. I think their personalities can be also similar because separation makes no obstruction for them to keep having their inherited characteristics. Maybe they even behave more naturally and have similar personality, because separation doesn’t make the gap of brotherly social standing.
Since genes play a significant role in personality, identical twins who 100% shares the same genes will have numbers of things in common as adult. However, since environment can influence people to some extent, it is true that twins will have some differences in their personality.
As Brian says, if one twin drinks beer and other not, it will be expected that the twins will have a different reaction to alcohol.
I agree with fawn’s idea that the same gene they inherited from parents makes them to have the same personality even they are separated at birth. I was surprised when I understood how genes are important to shape each individual’s personality.
I disagree with the statement that the twins will be different from those experiances. The fact remains that IF the clean twin did drink, his genetics would dictate that he will become an alcoholic like his brother. The sober twin is a alcoholic, he just doesn't realize it yet. They are slaves to their genetics and they cannot escape that fact, hence they have similar traits as adults. However, not exactly the same, the twin that hadn't drunk the beer may become a CEO of a company and become extremely self-reliant and indepedent whereas the drunkard of a brother will become dependent and lazy. In this way the twins will become two seperate, but similar people.
as mariana stated, identical twins have 100% similar genes. I don't have friends or relatives who are identical twins, but I do believe that twins brought up apart from each other will develop many similar behavior patterns because of their genes. As I wrote in the other blog question, I could find many similarities between my brother and I even though we grew up in entirely different environments. However, I also with mariana that nurture can cause differences between identical twins. Brian's alcohol example shows that whether or not a twin becomes alcoholic depends on his/her exposure to alcohol.
It is true that family environment influences children's altitudes, values, manners, faith, and politics but their genes also have some strong effects on their personalities, which means that twins should have many things in common as adults. Also it is more likely that identical twins have these things more than fraternal twins because they share 100% of the genes while fraternal twins share only 50% of the genes.
As Nicha said, I do not agree that nurturing has great effects either because a child bears more similarities to their biological parents than to their adoptive parents by their traits and habis, and this explains that genes have more effects than environment.
I am still more into nurture side. Even though Fraternal twins may look the same, however, their characteristics may be an absolute different just like what Ruby mentioned. I personally think that the environment around them is what shaped their personalities, which is what like what Andrew said.
If identical twins grow up in a different environment, one live in a peaceful environment while one live in a chaostic one. You can conclude that their personal will change aftertime.
Well, one is that since they have the same dna, they have the same inborn reaction to their enviroments. If someone took two twins and put them in identical enviroments, they would get identical people. I'm not saying that they are in the same enviroment, that would be impossible. But the places they go are very similar. Even though they are seperated, they usually stay in the same culture, and go to somewhat similar families. Also I believe that there is a biasis when it come to these cases. People are looking for similarities between the two. I'm sure that there are twins out there who were seperated, and are completely different. After all, there are twins who grow up together who don't act the same at all. Also if someone spends enough time with the seperated twins, I'm sure that they would start to see the differences that weren't apparent on the surface.
I do agree with brian das that their identical genes make it more likely for them to be similar. Thus I disagree with what Andrew Lai said, genese do play an important part of what makes us who we are, and not just the enviroment.
Since twins separated at birth have had a chance living individually not knowing he/she has a twin, they would live perfectly normal lives, with their own personalities, interests, and ethical choices. But if compared to twins that have lived together ever since they were born, it makes a big difference in the way they see themselves because they can always strive to be 'different' from the other twin or be in competition with each other because they are actually see together and this causes family and friends to make huge comparisons to the twins.
I know some friends who are (fraternal) twins, and whenever people would compare them, for example, a common question would regard "why don't you both share/ or do (a particular activity)?" since people would expect them to act exactly the same in every single situation they faced. But in truth, the twins don't have a lot in common. They look slightly different- one is taller with a more feminine side, and the other twin is shorter and has a tomboy-ish side to her.
I totally agree with Sirada in her saying that genes play a very minor role in their development in personality and interests, since they are influenced by family, friends, and the environment which can change each twin's point of view towards certain matters.
I also agree with Brian's alcoholic gene theory because separated twins can live in totally different environments, which can greatly influence their desire or chance of drinking.
i think that twins will be the same in the appearance but the behaviours would be different, because they choose their ways to act.
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