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