X-linkage, lyonization and a female premium in the verbal iq results of orkney schoolchildren, 1947–75

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Journal of Biosocial Science 29 (1):63-72 (1997)
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Abstract

This paper reports the preliminary findings of an analysis of the Moray House (verbal IQ) results of a base sample of 4383 Orkney children due to be tested in the schools at age 11±1[fraction one-half] years in 1947–75. Girls enjoy a 3·63% premium relative to phenotypically equivalent boys at test age. Relationships within the sample, which includes some members of the parental generation, are known. The trait is found to be X-linked, with nine phenotypes in the boys, and lyonization is involved

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10.1017/s0021932097000631

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