Multiple choice

Crossing over occurs between

  1. two sister chromatids of the same chromosome

  2. two non- sister chromatids of the same chromosome

  3. two non-sister chromatids of the homologous chromosome

  4. two sister chromatids of the homologous chromosome
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Crossing over occurs between non-sister chromatids of homologous chromosomes (one maternal, one paternal). Sister chromatids are identical copies and do not exchange genetic material with each other.

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