The key factor that determines whether the undifferentiated gonads develop into testes is the
A) gene Sry located on the Y chromosome.
B) secretion of testosterone from the adrenals.
C) gene Sry located on the X chromosome.
D) 21st pair of chromosomes.
E) secretion of androgens from the gonads.

Question

Quizplus · Accepted Answer

The gene Sry (Sex-determining Region Y) located on the Y chromosome is the key factor that determines whether the undifferentiated gonads develop into testes. The gene is responsible for initiating a cascade of events that lead to the formation of testes in males. Without this gene, ovaries will develop instead of testes, resulting in a female phenotype.

The Key Factor That Determines Whether the Undifferentiated Gonads Develop