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Question

Crossing over takes place in

A
zygotene
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B
pachytene
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C
diplotene
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D
diakinesis
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Solution

The correct option is B pachytene
Crossing over takes place during the pachytene stage. During this stage, non-sister chromatids of homologous chromosomes may exchange segments over regions of homology. Sex chromosomes, however, are not wholly identical, and only exchange information over a small region of homology. At the sites where exchange happens, chiasmata form. There are no gaps in information formed as a result of the process. Crossing over is also an enzyme-mediated process and the enzyme involved is called recombinase.

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