AP Biologyeasymcq1 pt
If two genes are 20 map units apart, the expected recombination frequency is
A.20%
B.50%
C.80%
D.0%
Explanation
Core Concept
Recombination frequency is the fraction of recombinant gametes or offspring observed for two loci. For relatively short genetic distances, 1 map unit (centimorgan) corresponds approximately to a 1% recombination frequency, so loci 20 map units apart are expected to show about 20% recombination. This does not mean 'one of five meioses' contains a crossover, because crossover events and recombinant chromatids are not related that way.
Correct Answer
A20%
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