When does recombination occur?
A) before DNA replication
B) at the two-strand stage, when each member of a homologous chromosome pair is composed of two sister chromatids, and before DNA replication
C) at the four-strand stage, when each member of a homologous chromosome pair is composed of two sister chromatids, and before DNA replication
D) at the two-strand stage, when the sister chromatids have been separated, and after DNA replication
E) at the four-strand stage, when each member of a homologous chromosome pair is composed of two sister chromatids, and after DNA replication
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