Sexual Differentiation of the Embryo Is Normally Determined by

question 35

Multiple Choice

Sexual differentiation of the embryo is normally determined by

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

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