Originally posted by Elok
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Any mutations or malfunctions in the expression of that gene, and things turn out very, very differently. Since it's really only that gene on the Y chromosome that determines sex, its alteration generally leads to an XY genotype displaying female characteristics, developing as a (sterile) female.
That does not mean, however, that the individual is actually a female; since the chromosomes contain genes for many other things, and since the Y chromosome contains different types of genes than an X chromosome...
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