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IQ resemblance of MZ and DZ twins and nontwin siblings
The evidence of adoption studies
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accuses Kamin adopted children adoption studies adoptive parents argues argument between-family bias biological mothers Burt Burt's calculation of heritability cent child compared corre cousin marriages criticism of Kamin debate differences in IQ dressed alike DZ twins effect ences environmental determinants estimates of heritability Eysenck claims Eysenck quotes families female DZs findings Freeman Fulker Fulker's criticism genes genetic factors genetic hypothesis greater IQ hereditarian heredity and environment Identical twins reared inbreeding depression incredible statistical errors intelligence IQ correlation IQ difference IQ scores Israeli Arabs issue Jarvik Jensen Kamin quotes Kamin's criticisms lation Lehrke Loehlin male DZ median correlations mental development neuroticism ordinary siblings pseudopairing reaction Recessive genes regression restricted variance sample Schiff study selective placement separated MZ twins separated twins Sex linkage sibs similarity of environment Skodak-Skeels social class Stanford Binet Stott studies of separated tester-bias tion true correlation twin studies twin-pairs Warsaw study within-family environments