PSYC12H3 Lecture Notes - Lecture 7: Twin, Heritability
Document Summary
Group differences in measurement of intellectual performance: major & o"brie(cid:374), 2005, male-famale math performance differences, black-white iq distribution. Intelligence is highly heritable: high correlation between parent iq and child iq. Iq of identical twins is highly related; more than fraternals. Iq of identical twins reared apart is highly related. Iq of adopted children is related to iq of biological mother, less related to iq of adopted mother. Iq of identical twins reared apart is less related than iq of identical twins reared together. Iq of fraternal twins is more strongly related than iq of regular siblings. Iq of adopted children is more similar than unrelated individuals reared apart. Nature vs. nurtue: both nature and nurture contribute to intelligence, but genetics certainly play role, heritability index = 0. 50 (may be as high as 0. 65) If within-group difference has genetic component, perhaps between-group difference has genetic component too: no.
