Here is a complete explanation of what Klinefelter is, from the causes, signs or symptoms, to how to treat it.

The testes of men with the nonmosaic (47,XXY) form of this condition show only rare, focal areas of spermatogenesis, and sperm are absent from the ejaculate. In these men, testicular sperm ...

The Impact of Sex Chromosomal Aneuploidy on Whale Biology Sex chromosomal aneuploidy, such as the XXY condition observed in Eau10b, occurs when an individual has an abnormal number of sex chromosomes.