Multiple choice

During meiosis, cross over occurs between which of the following?

  1. Non-sister chromatids of homologous chromosomes

  2. Sister chromatids of homologous chromosomes

  3. Sister chromatids of non-homologous chromosomes

  4. Non-sister chromatids or non-homologous chromosomes.
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A Correct answer
Explanation

Crossing over (genetic recombination) occurs specifically between non-sister chromatids of homologous chromosomes during prophase I of meiosis. This reciprocal exchange of genetic material creates new combinations of alleles. Sister chromatids are identical copies and do not undergo crossing over with each other.

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