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The synaptonemal complex first appears at

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

Correct answer: zygotene

Solution

The synaptonemal complex assembles during synapsis, when homologous chromosomes start aligning and pairing. This occurs in zygotene, not later stages like pachytene or diplotene.

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