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Unformatted text preview: Bottleneck- sudden decrease in population size (disease, nature, etc) Survivors then have smaller gene pool. Founder effect- if founding group is small the allele frequency differ from source populations (islands) Gene flow- movement of alleles from one population to another occurs when individuals leave a population, join another, and breed Mutation restores genetic diversity by introducing new alleles. ULTIMATE SOURCE OF ALL GENETIC INNOVATION.-random with respect to fitness-most mutation result in deleterious alleles-alleles that lower fitness, since its random...
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- Fall '06