Final answer:
Crossing over in Prophase I of meiosis enhances genetic diversity in gametes by promoting recombination of genetic material between non-sister chromatids.
Explanation:
Crossing over during Prophase I of meiosis increases genetic diversity by allowing the exchange of genetic material between non-sister chromatids of homologous chromosomes. This process, known as recombination, results in new combinations of genes within gametes, enhancing variation.
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