Two linked genes show a recombination frequency of 10 per cent. The distance between them on the chromosome map is
Correct answer: A. 10 map units
- A. 10 map units
- B. 1 map unit
- C. 90 map units
- D. 100 map units
Explanation
One map unit, or centimorgan, is defined as a recombination frequency of one per cent, so ten per cent recombinants means ten map units apart. The logic is that the further apart two genes lie, the more likely a chiasma forms between them. Frequencies above fifty per cent are never observed, because at that point the genes assort as though unlinked.
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About Gene Linkage and Crossing Over
Linked genes lie on the same chromosome and tend to pass together, unlike genes that assort independently on different chromosomes. The topic connects linkage with homologous pairing, crossing over during prophase I of meiosis, recombinant and parental offspring, and recombination frequency as an estimate of gene distance.
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