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Beginning of masculinization of external genitalia. Development of the reproductive system.

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This page was last edited on 6 September , at The development of sexual differences begins with the XY sex-determination system that is present in humans, and complex mechanisms are responsible for the development of the phenotypic differences between male and female humans from an undifferentiated zygote.

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A sufficient amount of any androgen can cause external masculinization. MIS blocks the development of paramesonephric ducts , promoting their regression. Disruption of typical development may result in the development of both, or neither, duct system, which may produce morphologically intersex individuals.

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When she wakes, note what name she says first. Development of wolffian ducts. If you want a boy, then, you should try to have sex as close as possible to ovulation, to give the male sperm a fighting chance; if you want a girl, you should have sex two to four days before you ovulate.