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Crossing over occurs during

  • A.metaphase II of meiosis
  • B.prophase of mitosis
  • C.anaphase I of meiosis
  • D.prophase I of meiosis

Answer: D

Homologous chromosomes pair and exchange segments at chiasmata, which is the principal source of new combinations within a chromosome. Mitosis involves no such pairing. The exchange is reciprocal, so no genetic material is gained or lost overall.

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