Dictionary of Human Evolution and Biology

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Double-Y Syndrome

Chromosome aneuploidy (2N 47,XYY) in which the extra Y chromosome produces phenotypically tall males prone to acne, who were originally alleged to possess extra copies of male genes (a hormonal dosage effect) that putatively increase aggressive and criminal behavior; this hypothesis is incorrect. The controversial initial studies concerning behavior have never been satisfactorily replicated. Aka Jacob syndrome, supermale, metamale. Affects 1:1,000 males.

See primary nondisjunction.

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