Pop_Gen_II__Activity_2009 - Presectionreading:,Ch7,p232236...

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Genetic Drift Simulation Pre-section reading: Evolutionary Analysis, Ch 7, p232-236 Genetic drift is change in the frequency of alleles in a population that occurs due to random events. A primary cause of genetic drift in populations is sampling error . Sampling error is the difference in allele frequency between two generations that occurs because genes in the offspring gene pool are a random sample of genes from the parental gene pool. Thus, changes in allele frequency (and phenotype frequency) in a population can occur even when there is no natural selection. Over long periods of time, genetic drift causes some alleles to drift to a frequency of 1 in the population (meaning all of the copies of that gene in the population are the same). This is fixation . Genetic drift also causes complete loss of some alleles, meaning they get to a frequency of zero and are no longer present in the gene pool. Both the size of a population and the starting allele frequencies in a population have a strong affect on how fast drift causes fixation and loss.
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  • Spring '07
  • Samplingerroristhedifferenceinallelefrequencybetweentwogenerationsthat occursbecausegenesintheoffspringgenepoolarearandomsampleofgenesfrom, thepopulation.Eachteamwillsimulatereproductionina populationofmicebyfollowingthestepsbelow.Youwill trackthefrequencyofallelesthatcausecoatcolor.There, Equalallelefrequencies TypeB TypeD, Smallpopulation Largepopulation TypeA

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