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Question

Crossing over takes place between which chromatids and in which stage of the cell cycle?

A
Non-sister chromatids of non-homologous chromosome at zygotene stage of prophase-I
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B
Non-sister chromatids of homologous chromosome at pachytene stage of prophase-I
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C
Non-sister chromatids of homologous chromosome at zygotene stage of prophase I
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D
Non-sister cromatids of non-homologous chromosomes at pachytene stage of prophase I
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Solution

The correct option is B Non-sister chromatids of homologous chromosome at pachytene stage of prophase-I
Prophase I of meiosis I is divided into - leptotene, zygotene, pachytene, diplotene and diakinesis.
Crossing over is the exchange of genetic materials between non-sister chromatids of homologous chromosome. It takes place at pachytene stage of prophase-I.

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