October 26 lecture - October 26 Problem 1 Survey 100 humans...

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October 26 Problem 1: Survey 100 humans determine genotypes at the MN blood type locus MM:.19 MN:.50 NN:.32 Fr(M)=0.43 Fr(N)=0.57 Expected genotype frequencies under the null hypotheses of no evolution and random mating with respect to MN genotype fr(MM)=0.185 fr(MN)=0.49 fr(NN).325 Problem 2: Survey a tapeworm population and determine genotype frequencies at an autosomal locus observed: fr(AA): 0.30 Aa: 0.33 aa: 0.37 Expected(null): Fr(AA) .216 Aa .497 aa.286 I. How does selection act on quantitative traits? A. Directional selection 1. What is “directional” about directional selection? -the phenotypes are changing in one direction (average phenotype) 2. What happens to overall genetic variation? -“# and relative frequency of alleles?” decreases, because alleles with low fitness are being eliminated 3. Do allele frequencies change? Explain -yes favored alleles increase 4. If drought conditions continued, would overall variation eventually NOT be normally distributed? -mutation, independent assortment, recombination
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October 26 lecture - October 26 Problem 1 Survey 100 humans...

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