The X and Y chromosomes are known as the sex chromosomes, for the obvious reason that they determine the destination of human's gender. Simply, xx is for female and xy is for male. Everybody gets an X from his or her mother, but if you inherited y chromosome from your father you're male; if you inherited x from your father you're a female. Since men(XY) have no spare x chromosome, they are more likely to suffer recessive problems than women. Thus, haemophillia, colorblinndness and ilk are much more common in men's X.
This simple predestination can also go wrong and causing aneuplody. Aneuplody (abnormal number) of chromosomes. XXY syndrome and named by the Massachuset founder Klinefelter, a genetic disorder that is giving the patient 47 chromosomes in total (46 for normal).
Klinefelter's is a genetic disorder where the man has an extra x chromosome. Usually the patient has small testicle, low testosterone, tall and unpropotional body, and also teeth abnormalities. The disorder is the result of error that occured during the sperm forming during the meiosis
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