Crossing over take place between

Two non-sister chromatids of non-homologous chromosomes

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Two non-sister chromatids of homologous chromosomes

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Two sister chromatids of non-homologous chromosomes

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Two sister chromatids of homologous chromosomes

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Solution

The correct option is A Two non-sister chromatids of homologous chromosomes
Crossing over is a concept of genetics that is often called recombination. It occurs during meiosis. Crossing over is the exchange of chromosomal segments between non-sister chromatids of homologous chromosomes during the production of gametes. So the correct option is "Two non-sister chromatids of homologous chromosomes".

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