Which phrase best describes the process of crossing over? A. Pairs of homologous chromosomes exchange segments. B. Pairs of sister chromatids exchange segments. C. Pairs of homologous chromosomes become linked. D. Pairs of sister chromatids become linked.
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Answer

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Step 1
I'll solve this problem step by step, focusing on the biological concept of crossing over.

Step 2
: Understand the Terminology

Crossing over is a key genetic process that occurs during meiosis, specifically during prophase I of meiosis I. Let's analyze each option carefully.

Final Answer

Pairs of homologous chromosomes exchange segments.