Exam 2 -- Winter 2007 -- ANSWERS _do not distribute_

Exam 2 -- Winter 2007 -- ANSWERS _do not distribute_ - Bio...

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Bio 305 Genetics Exam #2 Form 1 Winter 2007 March 12, 2007 1 INSTRUCTIONS 1. For your exam to be scored, you MUST use a #2 pencil. The GSIs have extra if you need one. 2. BEFORE BEGINNING THE EXAM, fill out all information sections on the accompanying answer sheet COMPLETELY. a. Read and follow instructions on the form EXACTLY b. Grid in your NAME, STUDENT ID #, and FORM number 1 . c. Sign your answer sheet AND the THIS page of your exam . d. Be VERY NEAT. The scanning machine is very sensitive and stray pencil marks could be interpreted as answers. 3. Each question has only one BEST answer. 4. Assume genes are unlinked, completely penetrant and expressive, and in Hardy-Weinberg equilibrium UNLESS INDICATED OTHERWISE by the question. 5. When you finish, hand your answer sheet to a GSI personally. Do not give it to anyone else to hand in. Only one answer sheet will be accepted from each student and you must show your student ID. 6. The points for each question are indicated. There are 105 points possible, but the maximum score you can earn is 100. There are 28 questions. SUGGESTIONS: Work through the exam circling answers on your paper copy. If you get stuck on a question, skip it and come back to it later. If you finish early, review your answers. Only then (or with ~15 minutes of exam time left) should you fill in the scantron answer key. Double check that the answers you filled in match the circles you filled. Answering questions based on eliminating options is dangerous. Your best bet is to work out each problem completely before looking at answer choices. There is no penalty for guessing. FILL IN AN ANSWER FOR EVERY QUESTION. You have at least a 20% chance of guessing right!
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Bio 305 Genetics Exam #2 Form 1 Winter 2007 March 12, 2007 2 Six population cages of mice were set up with each containing 10 males and 10 females, all heterozygous (Aa) for the autosomal gene A. Two offspring (one male and one female) were collected from each female in a cage and used to start the next generation in that cage, maintaining a population size of 20. This was repeated for 20 generations in all six cages. In each generation, mice were genotyped to determine the frequency of the A allele. The plot shows frequency of A at each generation, with each line representing one of the six populations. 1. (2 pts) Based on the observed results, which process is most likely influencing the inheritance of the A allele over time? a. Balancing selection b. Stabilizing selection c. Directional selection d. Genetic drift e. Hardy-Weinberg equilibrium 2. (3 pts) If each population had contained 20,000 individuals at each generation instead of 20, how would you expect the results to change? a. Final allele frequencies in the six populations would all be closer to 0.5. b. The fixation of allele A would happen in fewer generations.
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This note was uploaded on 12/12/2010 for the course BIOL 305 taught by Professor Zhang during the Fall '10 term at University of Michigan.

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Exam 2 -- Winter 2007 -- ANSWERS _do not distribute_ - Bio...

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