Crossing over during meiosis occurs during which stage?

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Multiple Choice

Crossing over during meiosis occurs during which stage?

Explanation:
Crossing over is the exchange of genetic material between homologous chromosomes, which creates new combinations of alleles. This happens when homologs pair up in meiosis I during prophase I. As chromosomes pair, they form a tetrad and non-sister chromatids can swap segments at sites called chiasmata, aided by the synaptonemal complex. By the time the cell progresses to metaphase I and beyond, the exchange has already occurred, so there’s no crossing over during metaphase I, anaphase I, or in meiosis II (prophase II). Prophase I is the stage where homologous chromosomes actually physically recombine, making it the correct stage for crossing over.

Crossing over is the exchange of genetic material between homologous chromosomes, which creates new combinations of alleles. This happens when homologs pair up in meiosis I during prophase I. As chromosomes pair, they form a tetrad and non-sister chromatids can swap segments at sites called chiasmata, aided by the synaptonemal complex. By the time the cell progresses to metaphase I and beyond, the exchange has already occurred, so there’s no crossing over during metaphase I, anaphase I, or in meiosis II (prophase II). Prophase I is the stage where homologous chromosomes actually physically recombine, making it the correct stage for crossing over.

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