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(C) During the pachytene stage of prophase-$I$ of meiosis,crossing over occurs between non-sister chromatids of homologous chromosomes.Following this,

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Chiasmata

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(C) During the pachytene stage of prophase-$I$ of meiosis,crossing over occurs between non-sister chromatids of homologous chromosomes.Following this,in the diplotene stage,the homologous chromosomes begin to separate from each other except at the sites of crossovers.These $X$-shaped structures,which mark the sites where crossing over has occurred,are known as chiasmata.

..................... marks the site where crossing over has occurred.

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