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

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Crossing over, or recombination, is the exchange of chromosome segments between nonsister chromatids in meiosis. Crossing over creates new combinations of genes in the gametes that are not found in either parent, contributing to genetic diversity.

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