How is the twin method used to study genetic influences?
Answers:
and not only different environments but within the same enviormnets also; they woudl have to be identical twins; and here are lots of twins that live in the same environment have same genes but are totally different.
hope this help!
Identical twins have the same DNA. So differences between twins, even the most subtle differences, must be due to environment and not inheritance.
The twins don't necessarily have to have been raise separately. Most twins lead separate lives in adulthood, and may enjoy different lifestyles in childhood and adolescence.
An example, at least a skin study, that I have seen was two twins, one who spent a LOT of time surrounded by the sun during her youth. The other twin did not spend much time in the sun. Now, around age 40 or so, the twin who was in the sun have significant skin damage, including sagging and deep wrinkles. The other twin's skin is much more immature looking. You could do a twin study with many pairs of twins to prove that it is sun damage and other environmental effects, fairly than genetics, that causes aging of the skin.
By looking at identical twins (ie 100% same genetically) who have been separated and raise in different environments researchers can determine the effect of genes vs environment.
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