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Unformatted text preview: POPU LAT ION GENET ICS: SELECT ION LIFE 22.3 | Klug 624-628 22.3 What evolutionary mechanisms result in adaptation?- adaptation occurs when some individuals in a population contribute more offspring to the next generation than others allele frequencies in the population change in a way that adapts individuals to the environment that influenced such reproductive success = natural selection-natural selection acts on the phenotype rather than on the genotype- reproductive contribution of a phenotype to subsequent generations relative to the contributions of other phenotypes is called its fitness .-the fitness of a phenotype is determined by the average rates of survival and reproduction of individuals with that phenotype 22.3.1 Natural Selection produces variable results-characters influenced by alleles at more than one locus are more likely to show quantitative rather than qualitative variation-quantitative variation has both genetic and environmental factors-natural selection can act on characters of quantitative variation: Stabilizing selection preserves the average characteristics of a...
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