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Family environment may be related to childhood cognitive abilities either directly through environmental transmission or indirectly through correlations with parental genotypes. Using the methodology of quantitative behavioral genetics, the magnitude of such effects can be determined. In this study, these relations were investigated using measures of home environment obtained from infancy through 7 years of age and WISC-R full scale IQ on a sample of 153 adoptive and 136 nonadoptive families.
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Coon et al. (1990) studied this question.
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