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Extra practice questions for midterm II

Extra practice questions for midterm II - BIS 2B F09 More...

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BIS 2B F09 More practice questions for Midterm 2 1 . The Old-World Amish community in Pennsylvania began with 200 families that emigrated from Europe. This group permits marriage only among those descended from the original group. Some alleles that are rare in the rest of the American population are common in this group. This difference is best explained by: a) directional selection b) high mutation rates c) the fact that each family has many children d) founder effects e) short generation times 2. Define 'agent of selection', and identify the agents of selection in each of the following examples: a) changes in color in peppered moths b) eyespots in peacock tails c) large body size in male elephant seals d) maintenance of the allele causing sickle-cell anemia in parts of Africa 3 . Human blood can be typed using a three-allele system (IA, IB, IO). In a population at Hardy-Weinberg equilibrium, the genotypic frequencies were: f(IAIA) = 0.04, f(IBIB) = 0.01, f(IOIO) = 0.49 f(IAIO) = 0.28 f(IBIO) = 0.14. The frequency of the IAIB blood type was not calculated. What should it be? 4 . In a sample of 3000 earthworms, 81% of the animals were qq. If the Q locus has only two alleles and the population is in Hardy-Weinberg equilibrium, what proportion of the population should have the genotype Qq ?
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