What controls whether an embryo will develop testes or ovaries?
A.
Pituitary gland
B.
Hypothalamus
C.
Y chromosome
D.
Presence or absence of estrogen
The correct answer is:
C. Y chromosome.
The Y chromosome contains the SRY gene (Sex-determining Region Y), which triggers the development of testes in an embryo. If the SRY gene is present and functional, the embryo will develop testes; if it is absent, the embryo will typically develop ovaries.