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Context-Dependent Allele Effects
Grade Level
AP Biology
APB.413 Context-Dependent Allele Effects
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A population contains allele R for pathogen resistance. Resistance reduces infection but slows growth. If a pathogen disappears from the environment for many generations, which outcome is most consistent with natural selection?
A
R must increase because resistance alleles are always beneficial.
B
R may decrease if its growth cost lowers reproduction when resistance is no longer useful.
C
R must remain at the same frequency because selection cannot act without pathogens.
D
R must mutate into the nonresistant allele because the population no longer needs it.
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