Abstract
Jensen (1969, 1973) has used within-population heritability data to support his contention that IQ differences between races have a considerable genetic basis. Criticism of this reasoning has been frequent, but perhaps never categorical. A method is now described for illustrating the error simply and quantitatively. An example shows that high heritability of a property within each of two populations is consistent with a vanishingly small heritability in the combined population.
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