Large ears is a rare trait in a mainland population of mice. A female mouse homozygous for very large ears sneaks onto a boat and arrives at an island that already contains mice. This mixing will lead to a population with a higher incidence of big ears than the mainland population because of

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Quizplus · Accepted Answer

Gene flow occurs when individuals from one population migrate to another, introducing new alleles into the population. In this case, the female mouse with large ears introduces the allele for large ears to the island population, increasing the incidence of this trait.

Large Ears Is a Rare Trait in a Mainland Population