人类的性决定和性分化

Human Sexual Determination and Differentiation

人类的性别是在受精一刹那间决定的,但性别分化的自然方向是向女性形态结构发育,只有受到H—Y抗原和雄性激素的二次干扰,才向男性方向发育。性分化过程中任何一个环节发生问题,都可能导致性分化畸形。

Sexual differentiation is a sequential process beginning with the establishment of chromosomal sex at the time of fertilization, which is followed by the development f gonadal sex and culmination in the formation of the sexual phenotypes. Determinants on the Y chromosome cause the indifferent gonad to develop into a testis. Two hormonal secretions from the fetaltestis, then, transform the indifferent urogenital tract into one that is the characteristic of male.