Chapter 10 — LO 3 — Crossing Over and Genetic Recombination

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4 Terms

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When does crossing over occur?

During prophase I of meiosis.

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Which chromatids undergo crossing over?

Nonsister chromatids of homologous chromosomes.

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What is a chiasma?

A visible region where homologous chromatids remain associated following a crossover.

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How does crossing over produce variation?

It exchanges DNA segments and creates new combinations of alleles.