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.

Column $I$	Column $II$
$(A)$ Prophase-$I$	$(i)$ Chromosomes move towards poles with centromeres
$(B)$ Metaphase-$I$	$(ii)$ Half the number of chromosomes are observed
$(C)$ Anaphase-$I$	$(iii)$ Longest phase of Meiosis-$I$
$(D)$ Telophase-$I$	$(iv)$ Two nuclei are observed

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