SAT® Subject Test in Biology

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Variants in Fur Color


In a particular population of mice that lives in the Southwestern United States, there are two fur color variants: black and light brown. The black fur is a dominant trait in these mice. The population described lives in an area dominated by dark colored rock and that is populated by owls that prey upon mice that do not blend into the environment. The frequency of the black fur allele in this particular population is 0.6.

If the rock were to become covered by sand dunes, what change in the population would you predict?


The frequency of the dark fur color would increase.


The frequency of the light fur color would decrease.


The frequency of the dark fur color would decrease.


The frequency of the allele for fur color would remain the same.


The allele frequencies for dark and light fur color would become equal.