Exam 2 -- Winter 2006 _Practice2_ -- Blank

Exam 2 -- Winter 2006 _Practice2_ -- Blank - Bio 305...

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Bio 305 Genetics Exam #2 Special Code: 000000 Winter 2006 March 13, 2006 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 SPECIAL CODE (Top right corner of this page) on the Left-hand side of the answer sheet. SIGN THE BACK OF THE FORM UNDER “GENERAL PURPOSE ANSWER SHEET” AND ON YOUR EXAM COPY. c. Be VERY NEAT and careful when filling out the answer form. 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. 5. When you finish, hand your answer sheet to an instructor PERSONALLY. Do not give it to anyone else to hand in. Only one answer sheet will be accepted from each student. 6. The points for each question are indicated. Although there are 110 points possible, the highest possible score is 100. Therefore, DO THE PROBLEMS YOU ARE MOST CONFIDENT ABOUT FIRST! 7. Extra scratch paper is available. Raise your hand if you need it and a GSI will bring you some. 8. FILL IN AN ANSEWR FOR ALL QUESTIONS. There is no penalty for guessing. Even a 10% chance of guessing right is better than 0%! SUGGESTIONS : Work through exam circling answers on paper copy. When you are finished, review your answers. Only then, (or with ~15 minutes of exam time left) should you fill in the scantron answer key.
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Exam #2 Special Code: 000000 Winter 2006 March 13, 2006 2 Females from a true-breeding line of mice, each with 6 whiskers, were crossed to males from a true-breeding line of mice, each with 14 whiskers. The F 1 population had a mean of 10 whiskers and a variance of 0.8. F 1 mice were intercrossed to create an F 2 population with a mean of 10 whiskers and variance of 2.1. All crosses were performed under the same, controlled, laboratory conditions. 1. (5 pts) What is the heritability (H 2 ) for whisker number? (a) 0.00 (b) 0.25 (c) 0.38 (d) 0.60 (e) 0.62 (f) 0.75 (g) 0.80 (h) 1.3 (i) 1.6 (j) 2.1 In dogs, leg length is controlled by four genes, each with two alleles. Each uppercase allele (A,B,C,D) contributes 2 inches to leg length, whereas each lowercase allele (a,b,c,d) contributes 1 inch. Two dogs, each with the genotype AaBbCcDd (12 inch legs), are mated. 2. (3pts) How many distinct phenotypes are expected among the progeny? (a) 2 (b) 3 (c) 4 (d) 5 (e) 6 (f) 7 (g) 8 (h) 9 (i) 10 (j) 11 3. (2pts) What leg length should be observed most often? (a)
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Exam 2 -- Winter 2006 _Practice2_ -- Blank - Bio 305...

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