Midterm1S10key

Midterm1S10key - BIS 101-001(Engebrecht Midterm I Spring...

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Unformatted text preview: BIS 101-001 (Engebrecht) Midterm I April 22, 2010 Spring 2010 Form A DO NOT OPEN UNTIL INSTRUCTED Fill out your name, student identification number and form letter on the blue Scantron Form with a #2 pencil. READ THE QUESTIONS CAREFULLY BEFORE YOU ANSWER. Fill in your answers on the scantron form with a #2 pencil. For each question only choose one answer (the best answer) and fill in your selection clearly and completely. If you change an answer, make sure you erase the original selection completely. There are X pages including this cover sheet and X questions to this exam worth 100 points. No calculators or cell phones during the exam. The exam will end promptly at 10:20am. Good luck Questions 1-5: Flower color, pod color and stem length were three characters that Mendel studied. Each is controlled by an independently assorting gene and has dominant and recessive expression as follows: Flower color: Purple (P) = dominant; white (p) = recessive Pod color: Green (G) = dominant; yellow (g) = recessive Stem length: Tall (T) = dominant; dwarf (t) = recessive If a plant that is heterozygous for all three characters was allowed to self-fertilize: 1. (2pts) what proportion of the offspring would be expected to be homozygous for the three dominant traits A. 1/4 B. 9/64 C. 1/8 D. 1/32 E. 1/64 ¼ x ¼ x ¼ 2. (2pts) what proportion of the offspring would be expected to be homozygous for the three recessive traits A. 1/4 B. 9/64 C. 1/8 D. 1/32 F. 1/64 ¼ x ¼ x ¼ 3. (2pts) what proportion of the offspring would be expected to be heterozygous for all three traits A. 1/4 B. 9/64 C. 1/8 ½ x ½ x ½ D. 1/32 E. 1/64 4. (3pts) what proportion of the offspring would be expected to be homozygous for purple- colored flower and green pod color, heterozygous for tall stem length A. 1/4 B. 9/64 C. 1/8 D. 1/32 ¼ x ¼ x ½ E. 1/64 5. (3pts) what proportion of the offspring would be expected to phenotypically have purple flowers and yellow pods with tall stem length A. ¼ B. 9/64 ¾ x ¼ x ¾ C. 1/8 D. 1/32 E. 1/64 Refer to the following pedigrees for questions 6-8: 6. (2pts) What is the most likely mode of inheritance?...
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Midterm1S10key - BIS 101-001(Engebrecht Midterm I Spring...

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