Embryos with XY chromosomes become boys, and those with XX chromosomes become girls. That means that all our sex organs come from the same foundations: The testes in men are equivalent to labia and ovaries in women, and the penis is the equivalent of the clitoris. At around week 7the Y chromosome signals for the start of testosterone production, and male genitalia begin to develop. Between 16 and 20 weeks, testosterone levels fall until they reach the range found in early puberty by about 24 weeks.
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