Question

in the womb, the male and female fetus are physically identical until about seven weeks after conception, at which time the ______ triggers the testes to develop and to produce _______.
x chromosome; estradiol.
y chromosome; cortisone.
y chromosome; testosterone.
x chromosome; estrogen.

Explanation:

In human development, the Y chromosome is specific to males. It triggers the development of testes. Testes produce testosterone, a male - specific hormone. Estradiol and estrogen are female - related hormones. Cortisone is not directly related to the development of male reproductive organs in this context.

Answer:

C. Y chromosome; testosterone.