During meiosis, when do crossing over events occur?

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Multiple Choice

During meiosis, when do crossing over events occur?

Explanation:
Crossing over happens when homologous chromosomes pair up in the first division of meiosis. This pairing, called synapsis, brings together two homologs into a structure called a tetrad, and during the pachytene stage of prophase I, non-sister chromatids exchange segments. This genetic recombination shuffles alleles between homologs, producing new allele combinations in the gametes. By the time the cell moves into metaphase I and the subsequent stages, the crossing over has already occurred, which is why later stages don’t involve new exchanges.

Crossing over happens when homologous chromosomes pair up in the first division of meiosis. This pairing, called synapsis, brings together two homologs into a structure called a tetrad, and during the pachytene stage of prophase I, non-sister chromatids exchange segments. This genetic recombination shuffles alleles between homologs, producing new allele combinations in the gametes. By the time the cell moves into metaphase I and the subsequent stages, the crossing over has already occurred, which is why later stages don’t involve new exchanges.

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