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NEET-UG Biology

Meiosis I and the substages of prophase I — practice questions

3 questions in the bank on this idea. Below are 3 of them, exactly as they appear in a test.

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  1. Question 1 · difficulty L1 · recall

    In which substage of prophase I does synapsis of homologous chromosomes occur?

    • A. Leptotene
    • B. Zygotene
    • C. Pachytene
    • D. Diplotene

  2. Question 2 · difficulty L3 · application

    A meiotic cell shows homologous chromosomes paired as bivalents, and crossing over is occurring between non-sister chromatids. Which prophase I substage is most consistent with this observation?

    • A. Zygotene
    • B. Pachytene
    • C. Diplotene
    • D. Diakinesis

  3. Question 3 · difficulty L5 · analysis

    Three meiotic cells are observed during prophase I. P shows homologous chromosome pairing, Q shows crossing over between non-sister chromatids, and R shows homologues beginning to separate while remaining attached at chiasmata. Which sequence of substages matches P, Q and R?

    • A. Zygotene, pachytene, diplotene
    • B. Pachytene, zygotene, diplotene
    • C. Diplotene, pachytene, zygotene
    • D. Zygotene, diplotene, pachytene

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