Unit III Exam-B Spr11 KEY

Unit III Exam-B Spr11 KEY - BSC 2011 Unit III Exam Form B...

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BSC 2011 Unit III Exam – Form B Spring 2011 Name, please: _____________________________________ 1. Who believed that species could evolve by individuals striving to become better adapted to their environment generation after generation? A. Cuvier B. Lamarck C. Malthus D. Darwin E. Linnaeus 2. Let’s assume that the latest census of great blue herons that hang out by the FSU Reservation on Lake Bradford revealed a population of only 25 adult herons (so not likely to be in H/W equilibrium). For a gene that determines bill size, whereby the allele for stout bills is dominant to the allele for more slender bills, calculate the frequency of the recessive allele in this population if ten herons have slender bills and all other herons are heterozygous? 3. Blue light is that portion of the visible spectrum that penetrates the deepest into bodies of water. Ultraviolet (UV) light, though, can penetrate even deeper. A gene within a population of marine fish that inhabits depths from 500 m to 1,000 m has an allele for a photopigment that is sensitive to UV light, and another allele for a photopigment that is sensitive to blue light. Which graph below best depicts the predicted distribution of these alleles if the fish that carry these alleles prefer to locate themselves where they can see best? Use the following information to answer the three questions below. A large population of laboratory animals has been allowed to breed randomly for a number of generations. After several generations, 25% of the animals display a recessive phenotype, the same percentage as at the beginning of the breeding program. The rest of the animals show the dominant phenotype, with heterozygotes indistinguishable from the homozygous dominants. 4. What is the most reasonable conclusion that can be drawn from the fact that the frequency of the recessive trait has not changed over time? A) The population is undergoing genetic drift. B) The two phenotypes are about equally adaptive under laboratory conditions. C) The homozygous dominant genotype is lethal. D) There has been a high rate of mutation of the dominant allele to the recessive allele. E) There has been sexual selection favoring the recessive allele. 5. What is the estimated frequency of the dominant allele in the gene pool? A) 0.05 B) 0.25 C) 0.50 D) 0.75 E) Cannot be determined from this information. 6. What proportion of the population is probably heterozygous for this trait? A) 0.05 B) 0.25 C) 0.50 D) 0.75 E) Cannot be determined from this information. 1
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7. What is the frequency of the recessive allele for a particular gene in a population of frogs that is in Hardy-Weinberg equilibrium if the frequency of the heterozygote genotype is 0.42? A) 0.09 B) 0.30 C) 0.49 D) 0.70 E) Cannot be determined from this information.
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