04:56
Codes of Life: Studies of Twins Separated at Birth
In recent years a group of scientists known as behavior geneticists have been probing the relative impact of genetic and environmental influences using twin studies and comparing adoptive and biological siblings with one another. Because twins may...
03:31
Codes of Life: Gene-Environment Interaction
Using twin and adoption studies, behavior geneticists can mathematically estimate the degree to which variation among individuals can be attributed to their differing genes. The concept is heritability, the extent to which genes predispose certain...