Sexual Differentiation of the Embryo Is Normally Determined By

question 10

Multiple Choice

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.

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