BIO SCI 97 Study Guide - Chi-Squared Test, Allele Frequency, Genetic Drift
25 Dec 2022
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Allele frequencies do not change from generation to generation. Genotypic frequencies do not change from generation to generation. Chi square test can be used to test if the population is in h-w equilibrium. Can be directional, stabilizing, or disruptive: mutations. Consider how lethal dominant genes remain in a population: migration. Influx and efflux of individuals with different ratios of alleles will dramatically influence equilibrium: genetic drift. Genetic drift: chance fluctuations of allele frequencies that result due to. One allele frequencies are changed >>> the next generation begins with new frequencies. Over multiple generations, allele frequency will fluctuate. One allele will ultimately reach fixation >>> frequency of 1. 0. Directional selection: favored phenotype has a homozygous genotype. Selective coefficient (s): measurement of the extent natural selection reduces the contribution of a given genotype w + s = 1. Produces and maintains genetic diversity within a population when the heterozygous genotype is favored.
