Topic: Cell cycle, mitosis, meiosis· Cell Structure and Function

In meiosis crossing over is initiated at :

1. Pachytene

2. Leptotene

3. Zygotene

4. Diplotene

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Answer: 1. Pachytene

Key idea: Crossing over takes place at pachytene.

At pachytene (prophase I), recombination nodules form and the enzyme recombinase helps exchange segments between non-sister chromatids. Synapsis occurs at zygotene, and chiasmata become visible at diplotene.

Doubtly AI · 30 Oct 2026 AI-generated · not yet verified Report

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In meiosis crossing over is initiated at :

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