Dictionary of Human Evolution and Biology

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Sex Chromosome Aneuploidy

Condition that gives rise to an individual that has more or fewer chromosomes than a species’ standard or clinical standard. The error involves one or more sex chromosomes, as in XXX, XXXX, XXY, XYY, X,... etc.

See primary nondisjunction, sex chromosomes, triplo-X syndrome, Turner syndrome, Klinefelter syndrome, and double-Y syndrome.

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