Spring 08 Exam 3 - Name Date 1 Which of the following is...

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Page 1 Name: __________________________ Date: _____________ 1. Which of the following is not true of allopolyploidy? A) Alloploidy is much more common in animals than in plants. B) Many species of flowering plants arose by allopolyploidy. C) Allopolyploid plants have a different chromosome number than their parental plants. D) Speciation by polyploidy is a form of sympatric speciation. Ans: A Use the following to answer questions 2-3: The two graphs below represent phenotypic distribution of color variants in a population of organisms over time. The dashed line represents the distribution at an initial sampling time, while the second represents a sampling of a later generation. Population at t = 0 Population several generations later # of individuals Color phenotypes Lightest Darkest 2. The process illustrated by these graphs is called A) stabilizing selection. B) directional selection. C) disruptive selection. D) convergent evolution. E) divergent evolution. Ans: A 3. The graphs suggest that A) as the population evolved, the extreme phenotypes were selected against. B) as the population evolved, the intermediate phenotypes had greater reproductive success than the extreme phenotypes. C) the population is in Hardy-Weinberg equilibrium. D) natural selection is not occurring. E) Both A and B are correct. Ans: E 4. All of the following influenced Darwin's concept of evolution, except : A) Englishman Thomas Malthus' views on population growth v. food supply B) The view of natural theology. C) Selective breeding practices to improve livestock and crops. D) The slow pace of geological processes, indicating that the Earth is very old. Ans: B 5. In a population in Hardy-Weinberg equilibrium for alleles C and c, 84% of the population exhibit the dominant trait. Assuming C is dominant to c, what percent are homozygous dominant (CC)? [p 2 + 2pq+q 2 =1] A) 0.48 B) 0.60 C) 0.40 D) 0.36 E) 0.16 Ans: D
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Page 2 6. Which of the following statements is true about natural selection? A) Natural selection acts on the phenotypic variation in a population. B) The effect of natural selection on a population is that the members will exhibit varying rates of survival and reproduction. C) Natural selection acts by determining which organisms will live and die. D) A, B, and C are all true statements regarding natural selection. E) Only A and B are true statements. Ans: E 7. Paleontologists have pieced together from fossils the evolution of the whale from: A) aquatic reptiles. B) 4 legged, land dwelling mammals. C) sharks. D) porpoises. E) extinct aquatic birds. Ans: B 8. The most important finding from the fossil record for the theory of evolution is: A) that life has evolved through time. B) that life has changed very little over time. C) that most species are extinct. D) that fossils are old. Ans: A 9. Which of the following microevolutionary forces can allow a population to become adapted to its' environment?
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Spring 08 Exam 3 - Name Date 1 Which of the following is...

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