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Unformatted text preview: Bio 97 2007 Final Exam KEY Section A version D- pg 3 of 12 Name ______________________________ID # ___________________ 1 What version of the test do you have? A, B C or D? 2 The z, b, c, d and w genes are all on the X chromosome. Individual two-point testcrosses are set up for each pair of genes as shown below. The recombination frequencies are as indicated. Gene Loci % Recombination z,b 50 z,c 11 z,d 6 z,w 35 b,c 50 b,d 50 b,w 19 c,d 5 c,w 45 d,w 40 What is the order of these loci on the X chromosome? A. b,w,z,d,c B. b.z,w,d,c C. w,z,d,c,b D. c,d,w,b,z E. z,d,c,w,b 3 Sequencing of gene Snfn isolated from many cancer cells finds that in the vast majority of cancers, large and small deletions are found that remove parts of this gene (mutating it). In comparison, sequencing of gene Snfn from normal cells identifies a few polymorphisms. You conclude that: A. Snfn is an oncogene. B. Snfn is a gene that promotes the cell cycle. C. Snfn is not a real gene. D. Snfn is a transposon. E. Snfn is a tumor suppressor gene. 4 Consider three troll genes: Big +, dominant, big trolls big-, recessive, small trolls Mean +, dominant, mean trolls mean-, recessive, nice trolls Hairy+, dominant, hairy trolls hairy-, recessive, smooth trolls A testcross of a Big, Mean, Hairy troll that was heterozygous at all three loci yielded the following progeny (trolls are unusually prolific): 24 BMH 25 bmh 23 BMh 24 bmH 4 BmH 5 bMh 5 Bmh 6 bMH What are the linkage relationships of the three troll genes? A. M and H are 17.2 map units apart and B is not linked to either H or M. B. B and M are 7.8 map units apart and H and M are 9.5 map units apart. C. M and H are 24.1 map units apart and B and M are 9.5 map units apart. D. B and M are 17.2 map units apart and H is not linked to either B or M. E. B and H are 9.5 map units apart and B and M are 7.8 map units apart. Bio 97 2007 Final Exam KEY Section A version D- pg 4 of 12 5 Which of the following statements is FALSE? A. Genetic model organisms have been very important in defining genes that regulate development. B. A wing growing where a haltere should be is an example of a homeotic transformation. C. Once a cell is determined, it becomes totipotent. D. Segmentation genes act after egg-polarity genes and before segment identity is established. E. Genes that are regulated by morphogens have different sensitivities to their concentrations. 6 Fill in the blanks: The F plasmid is a ________________ plasmid that encodes the proteins necessary to produce the _____________ that physically connects two bacterial cells. Once DNA transfer begins it is ___________________. A. large, conjugation, unidirectional B. conjugative, pillus, bidirectional C. conjugative, pillus, unidirectional D. non-conjugative, pillus, unidirectional E. non-conjugative, lysogen, fast 7 In the martian fruit fly, the purple gene and the green gene are in two different linkage groups....
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