Chiasmata are formed due to

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(A) Chiasmata are $X$-shaped structures that form between homologous chromosomes during the diplotene stage of prophase-$I$ of meiosis. They represent

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Crossing over of same part between homologous chromosomes

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(A) Chiasmata are $X$-shaped structures that form between homologous chromosomes during the diplotene stage of prophase-$I$ of meiosis. They represent the sites where crossing over has occurred,which involves the exchange of genetic material between non-sister chromatids of homologous chromosomes. As the synaptonemal complex dissolves,the homologous chromosomes begin to separate but remain attached at these crossover points,known as chiasmata.

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