A mother will conceive dizygotic twins when ______.
a. she contributes an X-chromosome and the father contributes both an X-chromosome and a Y-chromosome
b. a woman produces a single ova that is fertilized by one sperm and the resulting ball of cells splits to form two individuals with the same gene
c. a woman produces two ova, which are fertilized by two sperm
d. a woman produces a single ova that is fertilized by two sperm
Ans: C
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a. True b. False
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