Natural Selection in Pocket Mice
A population of pocket mice lives on a substrate of dark lava rock. In this population, the mutant MC1R allele, which produces melanic (dark) fur, is found at a high frequency. Which of the following evolutionary mechanisms best explains the prevalence of this allele?
A
Directional selection favoring camouflage against predators
B
Mutagenic properties of the lava rock environment
C
Sexual selection based on mate preference for dark fur
D
Genetic drift randomly increasing the frequency of the allele
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