X-linkage, lyonization and a female premium in the verbal IQ results of Orkney schoolchildren, 1947-75.

Abstract excerpt

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 1/2 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...

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