Human Growth and Development / Unit 2 HGD 0155 short lesson, about 20 seconds
Sex-Chromosome Variations
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The idea
Aneuploidy is an atypical number of chromosomes; among sex chromosomes it includes Turner syndrome, a single X, and Klinefelter syndrome, XXY.
In practice
Turner syndrome in about one in two thousand five hundred females; Klinefelter in one in five hundred to one thousand males.
Where people slip
Other patterns include trisomy X, XXX, and XYY, each in about one in a thousand births of that sex.
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