Crossing over takes place between which chromatids and in which stage of the cell cycle?
- ANon-sister chromatids of non-homologous chromosomes at Zygotene stage of prophase $I$.
- BNon-sister chromatids of homologous chromosomes at Pachytene stage of prophase $I$.
- CNon-sister chromatids of homologous chromosomes at Zygotene stage of prophase $I$.
- DNon-sister chromatids of non-homologous chromosomes at Pachytene stage of prophase $I$.
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