Recombination is involved in the process of

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(C) During the pachytene substage of prophase-$I$ of meiosis,the non-sister chromatids of homologous chromosomes exchange genetic segments between the

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Crossing over

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(C) During the pachytene substage of prophase-$I$ of meiosis,the non-sister chromatids of homologous chromosomes exchange genetic segments between themselves.This exchange of chromatid segments is known as crossing over.Crossing over involves the breakage of $DNA$ strands followed by their fusion with the opposite chromatid,which leads to genetic recombination.

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