Crossing over takes place at a stage between

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(C) Crossing over is the exchange of genetic material between non-sister chromatids of homologous chromosomes.It occurs during the $Pachytene$ stage o

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Zygotene and pachytene

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(C) Crossing over is the exchange of genetic material between non-sister chromatids of homologous chromosomes.It occurs during the $Pachytene$ stage of $Prophase-I$ of meiosis.Since $Pachytene$ follows $Zygotene$ and precedes $Diplotene$,the process of crossing over is completed during the $Pachytene$ stage,which is the phase between $Zygotene$ and $Diplotene$.

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