Cell Division: Mitosis and Meiosis · Zoology

Crossing over between homologous chromosomes occurs during:

  1. Leptotene, when chromosomes first condense
  2. Zygotene, when homologs begin pairing
  3. Pachytene
  4. Diplotene, when chiasmata appear
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Correct answer: Pachytene

Crossing over occurs during the pachytene stage of prophase I. It involves exchange of genetic material between non-sister chromatids.

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