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B250WT3F04 - M.CO 411 MED PR E BIL 250/GU Genetics Form 1...

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Exam 3 BIL 250/GU “Genetics” 11/23/04 Form 1 Name: UM Student ID#: 1. Mark down your name, student ID, form number, and your seat number on the scantron (Answer sheet). 2. Write down your name and your student ID on the short answer question page now! 3. When you finish, please return your exam question sheet, your answer sheet (scantron) and your answers to the short answer questions. 4. Please silence your cell phones during exam! Multiple choice format (select the most appropriate choice to answer each question. Each question is worth 1 point) 1. For linked genes A, B, and C, if the A-B map distance is 1.56 map units and the B-C map distance is 4.06 map units and the number of double crossover events out of 10,000 offspring is 6, what is the coefficient of coincidence? Is the interference between the two crossover events a positive or negative? a. 0.15, negative b. 0.48, positive c. 0.57, no interference d. 0.89, negative e. 0.95, positive 2. If you have three genes (A, B, and C) linked on the same chromosome, how can you determine the gene order? a. Look for double crossover phenotypes involving the wild type and mutant alleles of genes A, B, and C. b. Look for single crossover phenotypes involving the wild type and mutant alleles of genes A, B, and C. c. Look for parental phenotypes. d.You cannot determine gene order by looking at the results of a cross. 3. Complete linkage results in the production of only __. 4. For 3 linked genes, the fraction of single crossovers between genes 1 and 2 and genes 2 and 3 are both 0.11 and the double crossover fraction is 0.0121. PREMED411.COM - PREMED411.COM - PREMED411.COM - PREMED411.COM - PREMED411.COM - PREMED411.COM - PREMED411.COM - PREMED411.COM - PREMED411.COM - PREMED411.COM - PREMED411.COM - PREMED411.COM - PREMED411.CO M
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Which of the following is true? 5. Phenotypically wild F1 female Drosophila , whose mothers had light eyes ( lt ) and fathers had straw ( stw ) bristles produced the following offspring when crossed to homozygous light-straw males: PHENOTYPE NUMBER light-straw 22 wild 18 light 990 straw 970 Total 2,000 The map distance between the light and straw loci is:
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