midterm 2006 key

midterm 2006 key - INSTRUCTORS: Steve Jacobsen Alvaro...

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INSTRUCTORS: Steve Jacobsen LS4 MIDTERM Friday November 3, 2006 Alvaro Sagasti STUDENT NAME: _______________________________________________ ID # _________________ (Last) (First) 1 Circle TA name Georgeann Jamie Lydia Matt Nicole Peter Ryan Timothy INSTRUCTIONS 1. This exam is 14 pages long including this front page, and the blank page at the end. Before starting make sure you have all the pages. Put your name and ID on each page!!!!!!!!! 2. No credit will be given for an illegible answer. Regrades will only be considered for answers written in pen (not pencil). 3. No graphing calculators are allowed. 4. Show all your work!! You will not be given credit for answers alone. Circle your answers! QUESTION VALUE SCORE 1 12 2 11 3 10 4 7 5 14 6 15 7 10 8 12 9 12 10 18 11 12 12 17 TOTALS 150
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INSTRUCTORS: Steve Jacobsen LS4 MIDTERM Friday November 3, 2006 Alvaro Sagasti STUDENT NAME: _______________________________________________ ID # _________________ (Last) (First) 2 1. (12 points) Matt In a particular plant species, stem length is either long or short and flower color is either blue or yellow. Stem length is controlled by a single gene, A. Flower color is controlled by another single genetic locus, B. Both A and B show complete dominance and reside on different chromosomes. True breeding long stemmed, blue flowered plants are crossed with true breeding short stemmed, yellow flowered plants and the resulting F 1 progeny are all long stemmed and yellow flowered. The F 1 progeny is allowed to self-fertilize. (a) (8 points) What is the phenotypic ratio amongst the F 2 ? P AAbb x aaBB F1 AaBb F2 Phenotypic ratio: 9/16 (A-B-) long stemmed, yellow flowered 3/16 (A-bb) long stemmed, blue flowered 3/16 (aaB-) short stemmed, yellow flowered 1/16 (aabb) short stemmed, blue flowered (b) (4 points) Amongst the F 2 progeny, the short stemmed, blue flowered plants are selected for a backcross to the F1 plants. What percentage of the progeny resulting from the backcross will be short stemmed and blue flowered? Backcross aabb x AaBb ¼ are aabb
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INSTRUCTORS: Steve Jacobsen LS4 MIDTERM Friday November 3, 2006 Alvaro Sagasti STUDENT NAME: _______________________________________________ ID # _________________ (Last) (First) 3 2. (11 points) Georgeann Examine the pedigree below to answer the following questions. (a) (3 points) How is this disease inherited? Recessive autosomal (b) (2 points) Is the disease gene X-linked? Why or why not? No, because the II-3 male didn’t inherit the disease from his mother. (c) (3 points) Assign genotypes to every individual in the pedigree. Write genotype labels above each individual. See above (a) (3 points) If II-1 married an affected individual and they had two children, what is the probability that one of their two children would be affected with the disease, and the other child would not be affected? 1/2
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This note was uploaded on 07/14/2008 for the course LS 4 taught by Professor Ribaya during the Fall '08 term at UCLA.

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midterm 2006 key - INSTRUCTORS: Steve Jacobsen Alvaro...

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