Klinefelter syndrome .. failure of chromosome sex separation during the division of men or women in the birth of mothers after the age of forty

Klinefelter Syndrome:
This syndrome or symptom arises from the increase of the sex chromosome (x) so that it is a chromosome 23 xxy rather than a xx or xy, and this error occurs as a result of the failure of the sex chromosome split during the split in men or women. This male syndrome affects only 1: 8000, or one infected, per 8,000 normal births.
This percentage increases in the births of mothers after the age of forty.
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