Exam 1 -- Winter 2005 -- Blank

Exam 1 -- Winter 2005 -- Blank - Bio 305 Genetics Hour Exam...

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Bio 305 Genetics Hour Exam #1 Special Code 000000 INSTRUCTIONS 1. THE ANSWER SHEET WILL NOT BE SCORABLE UNLESS YOU USE A #2 PENCIL TO FILL IT OUT. IF YOU DO NOT HAVE A #2 PENCIL, GET ONE FROM AN INSTRUCTOR 2. BEFORE BEGINNING THE EXAM, FILL OUT THE INFORMATIONAL SECTIONS ON THE ACCOMPANYING ANSWER SHEET COMPLETELY READ AND FOLLOW THE INSTRUCTIONS ON THE FORM EXACTLY GRID IN YOUR NAME, STUDENT I.D. #, AND EXAM CODE # ON THE LEFT-HAND PORTION OF THE ANSWER SHEET. BE SURE TO FILL IN THE CIRCLE IN THE "SPECIAL CODE" COLUMN THAT CORRESPONDS TO THE SPECIAL CODE # THAT APPEARS AT THE TOP OF THE EXAM PAGE. BE VERY NEAT AND CAREFUL WHEN FILLING OUT THE ANSWER SHEET. THE SCANNER IS SENSITIVE AND MAY INTERPRET STRAY PENCIL MARKS AS ANSWERS. 3. EACH QUESTION HAS ONLY ONE CORRECT (OR BEST) ANSWER; ONLY ONE CIRCLE PER QUESTION SHOULD BE FILLED. 4. WHEN YOU FINISH, HAND YOUR ANSWER SHEET TO AN INSTRUCTOR PERSONALLY . DO NOT GIVE IT TO ANYONE ELSE TO HAND IN . ONLY ONE ANSWER SHEET PER STUDENT WILL BE ACCEPTED. 5. THE EXAM CONSISTS OF 23 QUESTIONS EACH WORTH 5 POINTS. 100 POINTS IS A PERFECT SCORE. SUGGESTION : GO THROUGH THE EXAM, CIRCLING THE ANSWERS ON THE EXAM ITSELF (YOU CAN USE ANY PEN OR PENCIL FOR THAT). WAIT TO FILL IN THE CIRCLES ON THE ANSWER SHEET WITH A #2 PENCIL UNTIL YOU HAVE FINISHED THE EXAM AND REVIEWED YOUR CHOICES, OR UNTIL THE LAST 15 MINUTES OF THE EXAM PERIOD. 6. UNLESS INDICATED AS A POSSIBILITY IN THE QUESTION, ASSUME THAT THE GENES IN THE QUESTION ARE UNLINKED, AND THAT MUTATIONS ARE FULLY PENETRANT AND EXPRESSIVE.
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Hour Exam #1 Special Code 000000 (1) Consider the cross AaBb x AaBb. If trait A exhibits complete dominance, while trait B exhibits codominance, what phenotypic ratio is expected in the resulting offspring? (a) 9:3:3:1 (b) 3:6:3:1:2:1 (c) 9:3:1:2:1 (d) 1:2:1:2:4:2:1:2:1 (e) 2:4:2:2:4:2 (f) 1:1:1:1 (g) the ratio is not predictable (h) 9:3:4 (i) 9:7 (j) 15:1 (2) The following pedigree shows expression of a rare disease in the population. What is the probability that individual III.4 will display the disease trait? (a) 0.21 (b) 0.016 (c) 0.14 (d) 0.046 (e) 0.023 (f) 0.078 (g) 0.32 (h) 0.11 (i) 0.46 (j) 0.23 (3) Two strains of yeast are crossed. One has the mutation lys1-3 , which causes a defect in the synthesis of lysine; these mutants will only grow on media supplemented with lysine . The other has the spo20-1 mutation, which causes a defect in spore shape . Tetrads are assessed for the phenotype of each spore. The following abbreviations were used: la = lysine auxotroph; p = prototroph; ns = normal spore; as = abnormal spore shape Tetrad number Spore phenotypes 60 la/ns la/ns p/as p/as 8 la/as la/as p/ns p/ns 32 la/as la/ns p/ns p/as What is the simple map distance between the lys and spo genes? (a)
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Exam 1 -- Winter 2005 -- Blank - Bio 305 Genetics Hour Exam...

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