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Science. 1981 May 29;212(4498):1055-9.

Familial studies of intelligence: a review.

Abstract

A summary of 111 studies identified in a survey of the world literature on familial resemblances in measured intelligence reveals a profile of average correlations consistent with a polygenic mode of inheritance. There is, however, a marked degree of heterogeneity of the correlations within familial groupings, which is not moderated by sex of familial pairing or by type of intelligence test used.

PMID:
7195071
[PubMed - indexed for MEDLINE]
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