Biol2345Key - Name_KEY Thursday 8:05 AM 9:25 AM gtID_KEY...

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1 Name_________ KEY _______________________ gtID#_______ KEY ______________ Thursday February 11, 2010, 8:05 AM – 9:25 AM Genetics 2344 Exam #1 Instructions: 1. Put your name and gtID# at the top of this exam. 2. Put your full name in the Last Name and First Name portions of your scantron sheet. 3. Put your gtID# in the position marked Identification # on your scantron sheet (positions A-J). 4. The header of this exam starting on page 2 has a six digit number in it next to the word Exam Special Code. Write this number on the Special Code portion of your scantron sheet (positions K-P) . 5. Show your work (genotypes, crosses, algebra, etc) for short answer questions or problems . Numbers alone will not be sufficient to receive credit. You need not show your work for the multiple-choice questions. 6. Be sure to read the questions carefully. 7. Limit your answers to the number of words indicated if a limit is provided. 8. In all cases, assume complete penetrance and expressivity of traits. 9. The last page of the exam is an appendix that contains information that may be useful for answering some of the questions. 10. The estimated time to complete this exam is 63 minutes. 11. The exam must be handed in by 9:25. Late exams will not be accepted. -Good luck!
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Exam Special Code - 113693 2 1. Normal mitosis takes place in a diploid cell of genotype R/r ; Y/y. Which of the following might represent the genotype of a possible daughter cell? (1 min, 4 pts) A. R; Y B. r; y C. R/R; Y/Y D. R/r; Y/y E. either a or b 2. A pedigree showing the inheritance of blindness in dogs is shown below. Blind individuals have been shaded black. Assume that dogs Ib and IIe are heterozygous for the blindness gene. (2 min, 4 pts) Which of the five statements below is true? A. This pedigree is consistent with blindness being an autosomal dominant trait. B. This pedigree is consistent with blindness being an X-linked recessive trait. C. This pedigree is consistent with blindness being an X-linked dominant trait. D. The pedigree is consistent with blindness being a Y-linked trait. E. The pedigree is consistent with blindness being a cytoplasmic trait. 3. You look into your microscope and see 16 centromeres. How many chromosomes does the organism have? (1 min, 4 pts) A. 4 B. 8 C. 16 D. 32 E. 64 I II III a b a b c d e c d a b
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Exam Special Code - 113693 3 4. A female animal with genotype AaBb is crossed with a double recessive male (aabb). Their progeny include 442 AaBb, 458 aabb, 46 Aabb, and 54 aaBb. What is the distance in map units between the A and B genes? (3 min, 4 pts) A. 4.6 m.u. B. 5.4 m.u. C. 10.0 m.u. D. 10.4 m.u. E. 12.2 m.u. The following information applies to questions 5-9 (1 min, 2 pts each): The diagrams below purport to show anaphases in individual cells in a diploid organism of genotype A/a; B/b; D/d, whose genes are all on different chromosomes. . A line represents a chromosome or a chromatid and the dot indicates the position of the centromeres. Choose whether each drawing represents: A. mitosis B. meiosis I C. meiosis II D. either B or C E. Is impossible for this genotype 5.
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Biol2345Key - Name_KEY Thursday 8:05 AM 9:25 AM gtID_KEY...

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