During meiosis, crossing over occurs during which phase and what is the effect?

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Multiple Choice

During meiosis, crossing over occurs during which phase and what is the effect?

Explanation:
Crossing over happens when homologous chromosomes pair up in prophase I of meiosis. During this stage, the paired chromosomes form a tetrad and exchange segments between non-sister chromatids at the chiasmata. This genetic material swap creates recombinant chromatids, giving each chromosome a mix of maternal and paternal alleles. The result is genetic recombination between homologous chromosomes, which increases variation in gametes. This event is specific to prophase I and doesn’t occur in the later stages like metaphase II, anaphase I, or telophase I.

Crossing over happens when homologous chromosomes pair up in prophase I of meiosis. During this stage, the paired chromosomes form a tetrad and exchange segments between non-sister chromatids at the chiasmata. This genetic material swap creates recombinant chromatids, giving each chromosome a mix of maternal and paternal alleles. The result is genetic recombination between homologous chromosomes, which increases variation in gametes. This event is specific to prophase I and doesn’t occur in the later stages like metaphase II, anaphase I, or telophase I.

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