How is sex determined in humans

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Sex portal Biology portal. And what about the first impression of the embryo sex? Normal and abnormal sexual differentiation. Subsequent development of one set and degeneration of the other depends on the presence or absence of two testicular hormones: Effects on gender identity of prenatal androgens and genital appearance: The importance of the Y chromosome In mammals, the genetic sex is established at fertilization with the inheritance of an X or Y chromosome of their father. Exceptions to this are cases of XX males or XY females, or other syndromes. Apart from the SRY gene, there is a number of other genes that contribute dramatically to the sex determination, as it has been proven from sex reversal disorders.

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