Which of the following exchange chromosomal segments during crossing over?

Non-sister chromatids

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Sister chromatids

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Allele

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None of the above

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Solution

The correct option is A Non-sister chromatids
Crossing over is the phenomena in which there is an exchange of the genetic material between the two homologous chromosomes. The non-sister chromatids of the homologous chromosomes are involved in the crossover. The chiasmata is formed between the non-sister chromatids.
Thus, the correct answer is option A.

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