Exam__3 - Page 1 BIOL 1362 Exam 3 Spring 2007 BLUE 1. Which...

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Unformatted text preview: Page 1 BIOL 1362 Exam 3 Spring 2007 BLUE 1. Which of the following statements is true about natural selection? A) Natural selection acts by preserving traits acquired during an individual's lifetime. B) Natural selection acts on the phenotypic variation in a population. C) The effect of natural selection on a population is that the members will exhibit varying rates of survival and reproduction. D) A, B, and C are all true statements regarding natural selection. E) Only B and C are true statements. Ans: E 2. The feature that hybrid sterility and low hybrid viability have in common is that A) both result in the initial production of viable hybrid offspring. B) fertilization of the egg does not take place. C) the hybrid dies during development and is not born. D) a mechanical barrier to reproduction occurs. E) None of A-D are common to both. Ans: A 3. Which of the following microevolutionary forces can allow a population to become adapted to its' environment? A) Nonrandom mating B) Natural selection C) Migration D) Genetic drift E) Mutation Ans: B 4. Which of the following is not true of polyploidy? A) Polyploidy is more common in animals than in plants. B) Many species of flowering plants arose by polyploidy. C) Polyploidy can create new species in one generation. D) Speciation by polyploidy is a form of sympatric speciation. Ans: A 5. Comparison of features among related organisms which are shown to be similar in structure, but vary in function, are termed: A) homoplastic B) convergent C) homologous D) divergent E) identical Ans: C 6. The forces of _________ change allele frequencies in populations over just a few successive generations. A) directional selection. B) macroevolution C) Hardy-Weinberg equilibrium D) microevolution E) adaptive radiation. Ans: D 7. Evolutionary modifications that improve the survival and reproductive success of an organism are called: A) mutations. B) homoplastic traits. C) artificial traits. D) adaptations. E) vestigial structures. Ans: D Page 2 8. In a sexually reproducing population, when the allele frequencies predicted by the Hardy-Weinberg equation deviate from the actual experimental results, this tells us the population under study is: A) at genetic equilibrium. B) growing. C) migrating. D) evolving. E) mutating. Ans: D 9. Organs or parts of organs that are seemingly nonfunctional and degenerate, often undersized or lacking some essential part, are referred to as A) fossilized organs. B) homoplastic organs. C) mutant organs. D) homologous organs. E) vestigial organs. Ans: E Use the following to answer questions 10-12: A recessive phenotype ( bb ) is found among 400 individuals in a population of 10,000. This population is in Hardy- Weinberg equilibrium. Hardy-Weinberg equation: p 2 + 2pq + q 2 = 1....
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This note was uploaded on 04/14/2008 for the course BIOL 1362 taught by Professor Loeblich during the Spring '08 term at University of Houston.

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Exam__3 - Page 1 BIOL 1362 Exam 3 Spring 2007 BLUE 1. Which...

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