HW_answers

HW_answers - Sample Hardy-Weinberg Problems Answers 1. In a...

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1. In a population of 100 individuals 49% are of the NN blood type. What percentage is expected to be MN assuming Hardy-Weinberg equilibrium? A. 9% B. 21% C. 42% D. 51% E. insufficient information to answer question Reason: q 2 = 49% or 0.49, so q = 0.7 and therefore p = 0.3. The genotype MN is heterozygous so the frequency = 2pq = 2(0.3)(0.7) = 0.42 = 42% 2. In the year 2500, five male space colonists and five female space colonists (all unrelated to each other) settle on an uninhabited Earthlike planet in the Andromeda galaxy. The colonists and their offspring randomly mate for generations. All ten of the original colonists had free earlobes, and two were heterozygous for that trait. The allele for free earlobes is dominant to the allele for attached earlobes. Which of these is closest to the allele frequency in the founding population? A. 0.1a, 0.9A B. 0.2a, 0.8A C. 0.5a, 0.5A D. 0.8a, 0.2A E. 0.4a, 0.6A Reason: Recessive allele frequency = 2/20 = 1/10 = 0.1. Dominant allele frequency = 1- 0.1 = 0.9. 3. In a Hardy-Weinberg population with two alleles, A and a, that are in equilibrium, the frequency of allele a is 0.1. What is the percentage of that population that is heterozygous for this allele? A. 90 B. 81 C. 49 D. 18 E. 10 Reason: p = 1- 0.1 = 0.9, 2pq = 2(0.9)(0.1) = 0.18 = 18% 4. In a hypothetical population of 1000 people, tests of blood-type genes show that 160 have the genotype AA, 480 have the genotype AB, and 360 have the genotype BB. What is the frequency of the B allele? A. 0.001
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HW_answers - Sample Hardy-Weinberg Problems Answers 1. In a...

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