Crossing over or recombination takes place in:

Zygotene

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Diplotene

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Leptotene

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Pachytene

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Solution

The correct option is D Pachytene
Crossing over or recombination takes place in pachytene.
In leptotene, there is condensation of chromatin.
In zygotene, there is synapsis or pairing of homologous chromosomes.
In diplotene, there is dissolution of synaptonemal complex.

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