Which of the following is correct for male sex differentiation?
A) The male phenotype is determined by the presence of either X or Y chromosomes.
B) Stimulation and development of the indifferent gonad is initiated by the sex-determining region of the Y chromosome (SRY) gene.
C) The müllerian ducts develop into the male reproductive tract.
D) Sertoli cells are stimulated to produce testosterone.
E) Testes have descended into the scrotum by 9 weeks' gestation.
Correct Answer:
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