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Unformatted text preview: d. The HardyWeinberg genotypic frequencies are ( p 1 q 1 r ) 2 5 p 2 1 q 2 1 r 2 1 2 pq 1 2 pr 1 2 qr 5 0.04 1 0.09 1 0.25 1 0.12 1 0.20 1 0.30 which are precisely the observed frequencies. So it ap pears that the population is in equilibrium. 4. In a large experimental Drosophila population, the fitness of a recessive phenotype is calculated to be 0.90, and the mutation rate to the recessive allele is 5 3 10 2 5 . If the population is allowed to come to equilibrium, what allele frequencies can be predicted? Solution Here mutation and selection are working in opposite di rections, so an equilibrium is predicted. Such an equilib rium is described by the formula In the present question, 5 5 3 10 2 5 and s 5 1 2 W 5 1 2 0.9 5 0.1. Hence p 5 1 2 0.022 5 0.978 q 5 5 3 10 2 5 10 2 1 5 2.2 3 10 2 2 5 0.022 q 5 s PROBLEMS B ASIC P ROBLEMS 1. What are the forces that can change the frequency of an allele in a population?...
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This note was uploaded on 01/10/2011 for the course BIOL BIOL taught by Professor Johnson during the Spring '08 term at Aberystwyth University.
 Spring '08
 JOHNSON
 Biology, Genetics, Population Genetics, Mutation

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