The Sex of Offspring Is Determined by Particular Chromosomes | Learn Science at Scitable - When is sex determined
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A human fetus does not develop its external sexual organs until seven weeks after fertilization. The fetus appears to be sexually indifferent, looking neither like a male or a female. Over the next five weeks, the fetus begins producing hormones that cause its. Sexual differentiation in humans is the process of development of sex differences in humans. Chromosomal sex is determined at the time of fertilization; a chromosome from the sperm cell, either X or Y, fuses with the X chromosome in the.