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Suppose that we have a scrub desert with light colored sand, and numerous patches of dark-colored rocks. Mice with two copies of a dark fur color allele are dark-colored and blend well with dark-colored rocks. Mice with two copies of a light color allele are light-colored and blend well with the sand. Mice with one copy of each (heterozygotes) are a brown color that does not blend well with either the sand or the dark-colored rocks. As a result, the brown mice are more susceptible to predators. Which type of selection is most likely to operate in this situation?

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