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 ofÂ
A. genetic drift.
B. gene flow.
C. natural selection.
D. increased mutation.
E. a bottleneck effect.
Answer: B
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