The purpose of the ovum's zona pellucida is to
a. Make a pathway for more than one sperm to reach the ovum.
b. Allow the 46 chromosomes from each gamete to merge.
c. Prevent multiple sperm from fertilizing the ovum.
d. Stimulate the ovum to begin mitotic cell division.
C
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A Once one sperm has entered the ovum, the zona pellucida changes to prevent
other sperm from entering.
B Each gamete (sperm and ovum) has only 23 chromosomes. There will be 46
chromosomes when they merge.
C Fertilization causes the zona pellucida to change its chemical composition so that
multiple sperm cannot fertilize the ovum.
D Mitotic cell division begins when the nuclei of the sperm and ovum unite.
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