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Exam1_2010_ANSWERS_A - Biology 152 Exam 1 March 8 2010 Name...

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Biology 152 Exam 1 March 8, 2010 Name ____________________ ID #__________________ Test Version – A Directions: Write your name above in the space provided. Using a #2 pencil, enter your last name, first name, and student ID number in the rectangular spaces provided on the separate scantron sheet. At the top of your Scatron indicate the version of the test that you are takikng ( A or B ) You also need to fill in the corresponding ovals. For each of the multiple choice questions, choose the best single answer and fill in the corresponding oval on the scantron sheet. 1) Which of the following must exist in a population before natural selection can act upon that population? A) Genetic variation among individuals B) Variation among individuals caused by environmental factors C) Sexual reproduction D) B and C only E) A, B, and C 2) During drought years on the Galapagos, small, easily eaten seeds become rare, leaving mostly large, hard-cased seeds that only birds with large beaks can eat. If a drought persists for several years, what should one expect to result from natural selection? A) Stabilizing selection. B) Individuals with small beaks evolving larger beaks, producing a population that has a larger average beak size. C) Small birds anticipating the long drought and eating more to gain weight and, consequently, growing larger beaks. D) More small-beaked birds dying than larger-beaked birds. The offspring produced in subsequent generations have a higher percentage of birds with large beaks. E) Larger birds eating less so smaller birds can survive. 3) Given a population that contains genetic variation, what is the correct sequence of the following events, under the influence of natural selection? 1. Well-adapted individuals leave more offspring than do poorly adapted individuals. 2. A change occurs in the environment. 3. Genetic frequencies within the population change. 4. Poorly adapted individuals have decreased survivorship. A) 2 4 1 3 B) 4 2 1 3 C) 4 1 2 3 D) 4 2 3 1
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E) 2 4 3 1 4) Which of these conditions should completely prevent the occurrence of natural selection in a population over time? A) All variation between individuals is due only to environmental factors. B) The climate does not change. C) The population size is extremely large. D) The population lives in a habitat where there are no competing species present. 5) About which of these did Darwin have the least understanding? A) that individuals in a population exhibit a good deal of variation B) that much of the variation between individuals in a population is inherited C) the factors that cause individuals in populations to struggle for survival D) the sources of genetic variations among individuals E) how a beneficial trait becomes more common in a population over the course of generations 6) Which of these evolutionary agents is most consistent at causing populations to become better suited to their environments over the course of generations? A) Mutation
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Exam1_2010_ANSWERS_A - Biology 152 Exam 1 March 8 2010 Name...

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