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Unformatted text preview: Mutation introduces new alleles. Natural selection: Directional selection decreases diversity by favoring one extreme phenotype in the population. o Natural selection shifts average value of trait toward one extreme or the other Stabilizing selection decreases diversity by favoring the average phenotype over both extremes. o Stabilizing selection decreases a populations genetic variation over time, but doesnt change its average trait value. Disruptive selection increases diversity by favoring both extremes, and selecting against the average. o Can result in speciation (formation of new species) CPS? : Which of following is not evolutionary mechanism since it cannot change allele frequencies in a population? C) Inbreeding Inbreeding (mating b/w relatives) reduces the frequency of heterozygotes and increases frequency of homozygotes in each generation....
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