BIOL 202 Lecture Notes - Lecture 3: Natural Selection 2, Genotype Frequency, Genetic Drift

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Allele: different genotypic representation of our dna ex: aa, aa, aa. Evolution: change in allele frequency in a population over time. Focus of lab 3: when no evolution is taking place. Hardy weinberg conditions: natural selection, mutation: only process that produces new alleles, genetic drift: occurs in small populations, when allelic frequencies change at random. Large sample = less variation: gene flow: migration, random mating. When no evolution takes place: no natural selection, no mutation: only process that produces new alleles, no genetic drift: could be possible due to infinite population size, no gene flow: migration, random mating. *1-5 guarantees no change in genotype frequencies* p2+2pq+q2=1 p2 = freq. (aa), 2pq = f(aa), q2= f(aa) We will be either all big a or all small a. probability of fixation initial frequency of the allele: second and third simulation = no genetic drift, fourth simulation = non-random mating. Aa and aa = one phenotype; aa = one phenotype.

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