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Practice_questions Prelim_II

Practice_questions Prelim_II - 1 Compare and contrast the...

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1. Compare and contrast the effects of the following evolutionary processes on the magnitude and direction of frequency change of allele A at a gene locus: (a) the relative fitness of the aa genotype is twice as high as that of the other two genotypes; (b ) the mutation rate from allele A to allele a is 5 10 -5 2. Describe two effects of genetic drift on allele frequencies in populations. 3. Identify a form of selection that maintains or increases genetic variation at (a) single locus trait and at (b) a quantitative and give an example of each. 4. Consider a population of insects that live only 1 year. At birth and at the end of the season, the population consisted of the following numbers of individuals of 3 genotypes at a protein locus. AA Aa aa No. newborns 100 40 30 No. adults 90 20 30 (a) What are the selection coefficients on the 3 genotypes? AA Aa aa Relative fitness 0.9 0.5 1 Selection coefficient (b) What form of selection does this represent?
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