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NDA 2025 GAT · General Knowledge · Cell Biology and Classification · hard

In which stage of meiosis does crossing over between non-sister chromatids of homologous chromosomes take place?

Single correct option

In which stage of meiosis does crossing over between non-sister chromatids of homologous chromosomes take place?
  1. A. Prophase II
  2. B. Metaphase I
  3. C. Prophase I
  4. D. Anaphase II
Show answer and solution

Answer: (C) Prophase I

Crossing over occurs during pachytene of prophase I, after homologous chromosomes pair up in synapsis, and it exchanges segments, producing new combinations of genes (genetic variation). Prophase II, metaphase I and anaphase II do not involve pairing of homologous chromosomes, so no crossing over happens there.
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Original question written in the NDA 2025 GAT pattern and checked twice for the correct answer. Not an official question paper. How we write and check questions · Corrections policy · Report a mistake