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In meiosis crossing over is initiated at

1. Pachytene
2. Leptotene
3. Zygotene
4. Diplotene

Correct answer: Pachytene

Solution

Crossing over is initiated in pachytene of prophase I, when homologous chromosomes are fully synapsed and genetic exchange can occur. Earlier stages are for pairing and synapsis, while later stages show chiasmata after exchange has occurred.

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