Biology 112 � First Hour Exam

Biology 112 � First Hour Exam - Biology 112 First...

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Biology 112 – First Hour Exam Name_______________________ READ THESE INSTRUCTIONS : The test has three sections. You will answer all of the multiple choice and short answer questions from Sections I and II. You will answer one essay from Section III. Budget your time. Section I (17 points) MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question. 1. (1 Point) Researchers have found fossils of Eocene horse species in Colorado. Deeper deposits contain smaller species, and more recent deposits contain larger species. How does this observation support the theory of evolution? A) It provides evidence that species change over time. B) It shows that all species are related to each other. C) It proves that environments have changed over time. D) It suggests that species are unchanging and of recent origin. E) It does not support the theory of evolution. 2. (1 Point) Which of the following is the best modern definition of evolution? A) inheritance of acquired characters B) descent without modification C) change in allele frequencies in a population over time D) survival of the fittest 3. (2 Points) A farmer uses triazine herbicide to control pigweed in his field. For the first few years, the triazine works well and almost all the pigweed dies; but after several years, the farmer sees more and more pigweed, no matter how often he applies triazine. Which of these actions is most likely to solve the farmer's problem? A) Trying a different herbicide B) Increasing the amount of triazine he puts on his fields
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C) Buying triazine from a different company D) Adding triazine more often to his fields 4. (1 Point) On the tree of life, the branch leading to animals is closer to fungi than it is to the branch leading to land plants. Which of the following statements is correct? A) Animals and land plants are more closely related to each other than either is to fungi. B) Animals and plants do not have a common ancestor. C) Fungi and animals do not have a common ancestor. D) Animals and fungi are more closely related to each other than animals are to land plants. 5. (2 Points) An earthquake decimates a ground-squirrel population. The surviving population happens to have broader stripes on average than the initial population. If broadness of stripes is genetically determined, what effect has the ground-squirrel population experienced during the earthquake? A) Directional selection B) Gene flow C) Disruptive selection D) A founder event E) A genetic bottleneck 6. (2 Points) Cystic fibrosis is a genetic disorder in homozygous recessives that causes death during the teenage years. If 9 in 10,000 newborn babies have the disease, what are the expected frequencies of the dominant (A1) and recessive (A2) alleles according to the Hardy-Weinberg model? A) f(A1) = 0.9600, f(A2) = 0.0400
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This note was uploaded on 02/10/2010 for the course BIO 112 taught by Professor Lbah during the Spring '10 term at Argosy University.

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Biology 112 � First Hour Exam - Biology 112 First...

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