Testing for evidence of an X-linked genetic basis for a greater proportion of males with high cognitive ability.

Abstract excerpt

X-linked genetic differences between male and females have been posited to cause greater variance in cognitive ability in males. Males with only one X chromosome tend to express the genes on the X chromosome more fully than females, who express an "average" of their two X chromosomes due to X-inactivation. Greater variability in expression of genes on the X chromosome could account for greater variability in male...

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