Abstract
A multivariate conditional path model was fitted to general cognitive ability and reading performance data obtained from members of 119 adoptive families and 120 nonadoptive families. Measures include Wechsler_R Full-Scale, Verbal, and Performance IQ scores and Peabody Individual Achievement Test (PIAT) Reading Recognition scores for both parents and 7-year-old offspring. Results of model-fitting analyses provide evidence for moderate phenotypic correlations between the PIAT and IQ measures, substantial heritability for IQ and Reading Recognition, and large genetic correlations among the traits, particularly with respect to Verbal IQ and Reading Recognition. Thus, IQ-academic achievement relationships may be largely due to genetic influences.
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