Sexual differentiation of the embryo is normally determined by:
A) the presence of the Y chromosome,which directs the undifferentiated gonads to develop into testes (when there is one X chromosome present as well) .
B) hormones produced by the placenta.
C) the presence of two X chromosomes,which causes the primordial testes to degrade.
D) the number of chromosomes,with males having 22 pairs and females having an extra pair of XX chromosomes.
E) the presence of two X chromosomes,which directs the undifferentiated gonads to develop into ovaries.
Correct Answer:
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