In meiosis, recombination occurs:

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Recombination in meiosis occurs only during prophase I and involves the exchange of chromosome fragments between chromatids of homologous chromosomes, a process known as crossing-over. This results in the shuffling of genetic material between homologous chromosomes, creating new combinations of alleles that contribute to genetic diversity. Recombination does not occur during prophase II, when the sister chromatids separate and are pulled to opposite poles of the cell.

In Meiosis, Recombination Occurs