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# HW_Review_Answers - SAMPLE PROBLEMS 1 Imagine a population...

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SAMPLE PROBLEMS 1) Imagine a population with the following distribution: 60 AA individuals, 120 Aa  individuals & 20 aa individuals. a) Calculate genotypic frequencies in this population Part a) is asking what is the proportion or percentage of each genotype: AA = 60 / 200 (the total number of individuals) = 0.3 Aa = 120 / 200 = 0.6 aa = 20 / 200 = 0.1 b) Calculate allelic frequencies in this population Part b) requires you to count alleles: # A a Total AA 60 120 0 120 Aa 120 120 120 240 aa 20 0 40 40 200 240 160 400 A = 240 / 400 = 0.6 a = 160 / 400 = 0.4 c) Calculate genotypic frequencies in the next generation assuming random mating  and no evolutionary forces Part c) requires you to apply the Hardy-Weinberg terms: p = A = 0.6 q = a = 0.4 AA frequency = p 2 Aa frequency = 2pq aa frequency = q 2

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AA = (0.6)  2  = 0.36 Aa = 2(0.6)(0.4) = 0.48 aa = (0.4) = 0.16 d) Is this population in Hardy-Weinberg equilibrium; why or why not?
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