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Tightly linked genes show more linkage than crossing over.

1. Tightly linked genes show more linkage than crossing over.
2. Crossing over occurs more frequently in tightly linked genes.
3. Tightly linked genes show less linkage than crossing over.
4. Crossing over does not occur in tightly linked genes.

Correct answer: Tightly linked genes show more linkage than crossing over.

Solution

Tightly linked genes are physically close on a chromosome, so crossing over is less likely to occur between them. Because they are separated less often, they show stronger linkage.

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