During which of the following stage the non-sister chromatids twist around and exchange segments with each other?

Diplotene

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Diakinesis

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Leptotene

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Pachytene

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Zygotene

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Solution

The correct option is D Pachytene
Pachytene stage is characterised by appearance of recombination nodules which are the actual site of breakage and exchange of chromosomal segments or crossing over.

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