In humans,clear sex differentiation occurs not at fertilization but after the second month of gestation.What is the first event of this differentiation?
A)formation of testosterone in male embryos
B)formation of estrogens in female embryos
C)anatomical differentiation of a penis in male embryos
D)activation of the SRY gene in male embryos and development of testes

Question

Quizplus · Accepted Answer

The first event of sex differentiation in humans is the activation of the SRY gene in male embryos, which leads to the development of testes. This occurs after the second month of gestation. Options A and B are incorrect because the formation of testosterone and estrogens occurs after the activation of the SRY gene. Option C is incorrect because anatomical differentiation of genitalia occurs at a later stage of development.

In Humans,clear Sex Differentiation Occurs Not at Fertilization but After