Exam 2 -- Winter 2005_Practice_ -- Blank

Exam 2 -- Winter 2005_Practice_ -- Blank - FORM 1 EXAM 2...

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FORM 1 1 EXAM 2 Name : Genetics 305 Section : Winter Term, 2005 ID# : Make sure to write your name on the top of all exam pages, including this page. Each question has one most correct answer. You may use a pencil when working the exam, but all final answers must be marked on this front page in pen . Part I: Multiple Choice : _________ x _________ = ____________ pts. Part II: True or False : _________ x _________ = ____________ pts. Circle the correct answer for each question 1 a b c d e 12 a b c d e 1 T F 2 a b c d e 13 a b c d e 2 T F 3 a b c d e 14 a b c d e 3 T F 4 a b c d e 15 a b c d e 4 T F 5 a b c d e 16 a b c d e 5 T F 6 a b c d e 17 a b c d e 6 T F 7 a b c d e 18 a b c d e 7 T F 8 a b c d e 19 a b c d e 8 T F 9 a b c d e 20 a b c d e 9 T F 10 a b c d e 21 a b c d e 10 T F 11 a b c d e 22 a b c d e 11 T F 12 T F Also, if you feel some questions or answers warrant more lengthy comment, please mark the test pages and then indicate on this page which questions we should look over: Please check questions : __________________________________________________________ When you are finished, submit both the answer sheet and your exam.
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FORM 1 2 Part I: Multiple Choice ( 4 points each x 22 = 88 points) Circle one best answer, and transfer it to the front page. 1. Blood types A, B, AB, and O are due to 3 alleles: I A , I B , and i. In a large population, these alleles occur with frequencies of 0.3, 0.5, and 0.2 respectively. If mating is random, what would be the combined frequency of all the heterozygotes for these alleles in a population? a. 0.30 b. 0.38 c. 0.60 d. 0.62 e. 0.70 2. You are studying an X-linked trait. There are two alleles, one showing complete dominance over the other and this trait exhibits 100% penetrance. In females, 64% show the dominant phenotype. What percentage of the males will show the dominant phenotype, assuming that this population is in Hardy-Weinberg equilibrium for the X-linked trait? a. 64% b. 60% c. 40% d. 36% e. 30% 3. Because individuals with cystic fibrosis die before they can reproduce, the coefficient of selection for homozygous recessive phenotype is 1 (s = 1). Assume that heterozygous carriers of the recessive mutant allele responsible for the disease are as fit as wild type homozygotes and the population frequency of the mutant allele is 0.02. Predict the incidence of cystic fibrosis in the population after one generation of selection.
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FORM 1 3 4. Assume that the height of the tobacco plant is controlled by 4 independently assorting genes. Two different alleles exist for genes A, B, and C, but only one allele for gene D is present in the population. Dominant alleles A, B, C contribute 2 cm each to the height while recessive alleles a, b, c contribute 0 cm to the height. DD contributes 40 cm to the height. If two pure lines with 52 cm height and 40 cm height plants crossed, which of the following is true ?
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