Exam1_2012KEY

A molecular clock based on dna sequences b a molecular

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Unformatted text preview: ication—Imperfect DNA polymerase fidelity, imperfect repair mechanisms. 2. Due to external (environmental) agents—radiation, chemicals, oxygen radicals. 4. List the five assumptions of Hardy ­Weinberg equilibrium (5 points): 1. Infinite population size. 2. Random mating. 3. No mutation. 4. No migration. 5. No natural selection. CIRCLE the letter for all correct statements. (More than one may be correct and partial credit is given for each correct answer). 5. Linus Pauling and Emile Zuckercandl together discovered, (3 points) a. a molecular clock based on DNA sequences. b. a molecular clock based on protein sequences. c. humans and chimps are more closely related than either is to horses. 6. In lab cultures of E. coli bacteria, you observe that clones with mutations enabling antibiotic resistance can be isolated from cultures to which you have added antibiotic to the media. Mutations conferring resistance in these clones (4 points) a. can be traced to the fact that antibiotics actually cause mutations. b. could be tra...
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