research has shown that identical twins separated at birth and brought up away from each other still remain shockingly similar in their personality, choices, and response to situations. so its hereditary that seems to mould them more than their environment.
but what about siblings sharing parents and their environment? no pair of siblings ever resemble each other, whether its their preferences of activities, their choice and habit of food (i.e. once they are on their own and get to choose), their emotional composition, or anything else. what's going on here? why does every human couple produce such a variety of babies? where do the genes evaporate then? in fact, you can expect any pair of siblings to be as different from each other as is possible to be, growing up together.
2 comments:
identical twins and siblings differ from each other through both genes and environment (if both are brought up in different environments)
so siblings do not share all genes, which might account for the differences in response.
additionally to make a valid comparison you will need to compare siblings that grow up in the same house versus those that don't; and compare this difference to people in the same age group who are not related.
it might be that siblings then show more togetherness, falling in between non-relations and identical twins.
statistical procedural suggestions taken. the question was more a wonder at how the same origins of genes can produce such varying combinations that have almost nothing in common.
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