Question

$crossing \: over \: occurs \: \: in \: \\ \\ 1)leptotene \\ 2)diplotene \\ 3)zygotene \\ 4)pachytene \\ \\ give \: \: \: \: reason \: \: \: behind \: \: \: your \: \: \: answer.....$
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Answer 1

Crossing over occurs in :

1. Leptotene

2. Diplotene

3. Zygotene

4. Pachytene ✅✅

Explanation: 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.