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final_2006_key - 1 Name ID BIS 101 03 Final READ THE...

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1 Name:________________________________ ID:____________________ BIS 101 - 03 Final June 10, 2006 READ THE FOLLOWING INSTRUCTIONS: Write your name and ID # LEGIBLY on each page of this exam. All work must be done in INK. Show ALL your work. This exam is worth 200 points. You have 110 minutes to complete the exam. ______________________________________________________________ AUTHORIZATION FOR PUBLIC DISTRIBUTION OF GRADED EXAMINATIONS I, _________________________________, ID#__________________________ authorize the University to publicly distribute my graded examination for BIS 101-03 . Date_______________ Signed:____________________________________ I, _________________________________, ID#__________________________ hereby certify that I have read and understood all the instructions given on this page. I also hereby agree not to give or take any outside help from other students and/or any written material during this examination. I certify that all the work presented here was executed by me and that I understand that the rules and regulations predicted in the University's Code of Academic Conduct will be applied if necessary. GOOD LUCK!
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2 Page: 3 ________ 4 ________ 5 ________ 6 ________ 7 ________ 8 ________ 9 ________ 8________ 9 ________ 10 ________ 11 ________ 12 ________ 13 ________ 14 ________ 15 ________ 16 ________ Total ________ Bonus ________
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3 Name:______________________________ (1) The DNA helices of each of the four chromatids of a meiotic bivalent in a Neurospora crassa heterozygote + b are shown below. The heteroduplex shown below was generated during meiotic DS DNA break repair. The A-T base pair is present in the + allele and the G-C base pair is present in the b allele. (a) Show how a 2 + : 6 b ascus is produced by gene conversion. Draw base pairing after conversion in the blank space in the Figure below. (6 points) Base pairing before conversion Base pairing after conversion Genotypes Genotypes of tetrad cells of ascospores ______________________________________________________________________ + _______ _ _ ____A_______ 5' ____A_______ 5’ + _____ _ _ _ _____ T_______ 3' ___ T_______ 3' + _____ _ _ _ ______A_______ 5' ______G_______ 5' b _____ _ _ _ ______C_______ 3' ______C_______ 3' b b _____ _ _ _ ______G_______ 5' ______G_______ 5' _____ _ _ _ ______C_______ 3' ______C_______ 3' b b _____ _ _ _ ______G_______ 5' ______G_______ 5' b _____ _ _ _ ______C_______ 3' ______C_______ 3' b b b (b) Show how a 3 + : 5 b ascus is produced. (6 points) + _____ _ _ _ ______A_______ 5' ______A_______ 5' + + _____ _ _ _ ______T_______ 3' ______T_______ 3' + _____ _ _ _ ______A______ 5' ______A______ 5' _____ _ _ _ ______C______ 3' ______C______ 3' +/b b ______ _ _ _ _____G______ 5' _____G______ 5' ______ _ _ _ _____C______ 3' _____C______ 3' b b _____ _ _ _ ______G______ 5' ______G______ 5' b _____ _ _ _ ______C______ 3' ______C______ 3' b b b
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