Twin Studies (Psychology)

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  • The scientific study that attempts to determine the relative contributions of genes and the environment to behavior and/or personality characteristics. Because twins usually share the same environment and are treated similarly by parents, investigators can compare the similarities seen in identical twins, who share both genes and the environment, with those in nonidentical twins, who share the same environment but have different genetic makeups. If identical twins are more alike in some characteristics than are nonidentical twins, such characteristics may have a strong genetic component. In studies of intelligence, it has generally been found that identical twins are more similar to each other than they are to other siblings. Likewise, fraternal twins are less similar to each other than are identical twins. Twin studies also ...

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