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XX male syndrome (also called de la Chapelle syndrome, for a researcher who characterized it in 1972[1]) is a rare sex chromosomal disorder. Usually it is caused by unequal crossing over between X and Y chromosomes during meiosis.
It is less common than Klinefelter syndrome.[2]
Symptoms include small testes, gynecomastia and sterility. Many individuals with this condition also have effeminate characteristics.
Men typically have one X chromosome and one Y chromosome in each diploid cell of their bodies. Women typically have two X chromosomes.
So-called XX males have two X chromosomes; thus they are genetically female but otherwise appear to be male.
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