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OJEE Crossing Over — practice questions

Explore 1 free Crossing Over questions in OJEE Biology. Open each question or exercise to read its content, reference answers and available explanation.

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Crossing Over questions and exercises with answers

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**Crossing over** between non-sister chromatids of homologous chromosomes occurs during which phase of meiosis?Read the answer and worked solution →

Worked practice questions

**Crossing over** between non-sister chromatids of homologous chromosomes occurs during which phase of meiosis?

  1. Prophase I — pachytene
  2. Metaphase I
  3. Anaphase I
  4. Prophase II
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Correct answer: A. Prophase I — pachytene

Crossing over occurs during the **pachytene** sub-phase of Prophase I, when bivalents (tetrads) have formed and chiasmata develop between non-sister chromatids of homologous chromosomes. It is the major source of genetic recombination.

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