Question

Which correctly describes crossing over?
the process whereby nonsister chromatids exchange genetic material
the process whereby homologous chromosomes are pulled to opposite poles of the cell
the process whereby sister chromatids are pulled to opposite poles of the cell
the process whereby homologous chromosome pairs align randomly along the metaphase plate

Answer 1

Crossing over refers to the exchange of genetic material between nonsister chromatids. This is what causes variation in our offspring. So, A is your answer.

Answer 2

@Tkayy__

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The process whereby nonsister chromatids exchange genetic material..