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# of individuals w/ a particular phenotype divided by total # of individuals in the population
occurence of mutations, nonrandom mating, genetic drift
reasons proportions of homozygotes & heterozygots can differ from Hardy-Weinberg predictions
no mutations occur, population is infinitely large, individuals neither leave nor enter population
conditions required for Hardy-Weinberg genetic equilibrium
type of populations most susceptible to loss of genetic variability as a result of genetic drift
attract potential mates
reason large, brightly colored tail feathers of male peacock are valuable to him
there may be phenotypic variability in a species, organisms that can interbreed may have different physcial characteristics, does not consider whether individuals of a species can mate
reason for major limitations to morphological concept of species
populations that live in different environments may be exposed to different selection pressures
reason speciation can occur as a result of geographic isolation
the hypothesis that evolution occurs at an irregular rate through geologic time
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