Critical to the prenatal development of the male and female anatomy is the

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The prenatal development of male and female anatomy is primarily influenced by the presence or absence of testosterone before birth. Testosterone, a hormone produced in the testes of males, guides the development of male physical characteristics. In its absence, female anatomy develops. This hormonal influence is more critical to sexual differentiation than factors like chromosome patterns (e.g., an extra chromosome at pair 21, which causes Down syndrome) or the role of other hormones like estrogen in this early stage.

Critical to the Prenatal Development of the Male and Female