Biology / Bio 0967 · Atom · ~20 seconds
Crossing Over and the Chiasma
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Crossing over exchanges segments between nonsister chromatids of paired homologs, visible afterward as an X-shaped structure called a chiasma.
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A recombination nodule marks the point where two nonsister chromatids break and rejoin, swapping DNA segments.
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Crossing over swaps segments between homologs — it does not change gene order along a chromosome.