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04/09/11(Sat)11:34 No.48005469 File1302363260.jpg-(31 KB, 427x567, IQ from adopted.jpg)
>>48005386 The
heritability of intelligence is now well established from numerous
adoption, twin, and family studies. Particularly noteworthy are the
genetic contributions of around 80% found in adult twins reared apart.
And most transracial adoption studies provide evidence for the
heritability of racial differences in IQ. For instance, Korean and
Vietnamese children adopted into white American and white Belgian homes
were examined in studies by E.A. Clark and J. Hanisee, by M. Frydman and
R. Lynn, and by M. Winick et al. Many had been hospitalized for
malnutrition. But they went on to develop IQs ten or more points higher
than their adoptive national norms. By contrast, the famous Minnesota
Transracial Adoption Study marked black/white differences emerged by age
17 even though the black children had been reared in white middle-class
families (Weinberg, Scarr & Waldman, 1992). |