BIO305_F04_Exam2 - Bio305 Genetics Exam II, Fall 2004 Your...

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Bio305 Genetics Exam II, Fall 2004 Name________________________ 1 Your Name _______________________________________ Signature _________________________________________ Student number ___________________________________ Section Number: __________________________________ Graduate Student Instructor: __________________________________ Please write your name on every page. There are 4 points for each of the 20 multiple-choice questions and 4 points for each of the 5 short-answer questions. There is a statistical table at the end of the exam, in case you need it. Blank paper has been attached to the exam to give you room to work. For the multiple choice questions, CIRCLE THE SINGLE BEST RESPONSE ON THE BOTTOM OF THIS PAGE. For the short-answer questions, SHOW YOUR CALCUALTIONS, AND EXPLAIN YOUR WORK CLEARLY AND NEATLY. OTHERWISE, WE WILL NOT BE ABLE TO GRANT PARTIAL CREDIT. WRITE YOUR ANSWERS BELOW THE PROBLEMS, NOT ON THIS PAGE. WRITE YOUR ANSWERS USING A NON-ERASABLE PEN. OTHERWISE WE WILL NOT BE ABLE TO CONSIDER ANY REQUESTS FOR REGRADING. (1) a b c d e f g h (11) a b c d e f g h (2) a b c d e f g (12) a b c d e f g h (3) a b c d e f g h (13) a b c d e f g h (4) a b c d e f g h (14) a b c d e f g (5) a b c d e f g h (15) a b c d e f g (6) a b c d e f g (16) a b c d e f g h (7) a b c d e f (17) a b c d e f g (8) a b c d e f g h (18) a b c d e f g h (9) a b c d e f g (19) a b c d e f g h (10) a b c d e f g h (20) a b c d e f g (21) (22) (23) (24) (25)
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Genetics Exam II, Fall 2004 Name________________________ 2 1. House mouse Mus musculus has 2n=40 chromosomes. How many chromosomes exist in a primary spermatocyte and how many in a secondary spermatocyte? a) 20, 20 b) 20, 40 c) 40, 20 d) 40, 40 e) 20, 10 f) 10, 10 g) 40, 10 h) 80, 20 2. In radishes, flower color may be red, purple, or white. No dominance is evident in flower color, and red × white yields all purple flowers. However, radish shape can be either long or oval, and long is dominant to oval. A white oval plant crossed with a plant of unknown genotype and phenotype yields the following offspring: ½ purple long and ½ purple oval The unknown parent a) is homozygous for flower color and radish shape b) had at least one red parent c) had at least one oval parent d) cannot be of long shape e) would produce only one color phenotype if selfed f) would produce three color phenotypes if selfed g) is heterozygous for flower color and radish shape 3. Achondroplasia (dwarfism) is an autosomal dominant human disorder. The pedigree for a family manifesting achondroplasia is shown below. II-2 and II-3 have already had 5 kids, as shown in the pedigree. What is the probability that their next child is a female with achondroplasia? a) 0.5
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BIO305_F04_Exam2 - Bio305 Genetics Exam II, Fall 2004 Your...

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