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Which of the following statements is not true of two genes that show 50% recombination frequency?

1. The genes are tightly linked
2. The genes show independent assortment
3. If the genes are present on the same chromosome, they undergo more than one crossovers in every meiosis
4. The genes may be on different chromosomes

Correct answer: The genes are tightly linked

Solution

A recombination frequency of 50% indicates the genes assort as if unlinked, which can happen if they are on different chromosomes or far apart on the same one. Tight linkage would produce a recombination frequency well below 50%, so that statement is not true.

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