PS287 Chapter Notes - Chapter 5: Nancy Chodorow, Penis Envy, Social Cognitive Theory
Document Summary
Gene contributions examined by comparing mono- and dizygotic twin (100 vs. 50% dna) Theory: genes explain greater similarities in behaviour between identical twins compared to fraternal twins when the environment of both is the exact same. One study: 3- and 4-year-old twins examined the genetic and environmental contribution to sex-typed behaviour. Greater correspondence in behaviour among mono than di. Greater correspondence between di than other siblings. Concluded both genetics and environment make significant contributions to sex- typed behaviour (genetics stronger for girls than boys) The environment accounts for a substantial portion of variability in gender atypical behaviour; genetics was a moderate amount. Twin studies also used to examine heritability of homosexuality. Concordance in monozygotic (24%) higher than dizygotic (10%) Could there maybe be more environmental similarity for identical twins because people. If one identical twin is homosexual, chance of other one is far from 100% create more similar environments for them. Aggression is one social behaviour with clear-cut sex differences.
