Crossing-over produces genetic variation during prophase I of meiosis I. This occurs when
A) homologous chromosomes come close together and a rearrangement of alleles occurs.
B) sister chromatids come close together and a rearrangement of alleles occurs.
C) random chromosomes come close together and a rearrangement of alleles occurs.
D) sister chromatids align randomly on the metaphase plate before they are separated.
Correct Answer:
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