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Unformatted text preview: BIO 319 Genetics Exam 2 October 23, 2009 Name____________________________ Question 1 (10 points) (Hollingsworth) You are trying to locate the gene that encodes a particular enzyme in flies. You know its on chromosome 3. You have five strains (shown below) with deletions for different regions of the third chromosome: You cross each strain with wild-type flies and measure the amounts of enzyme in the F1 progeny (summarized below). In what region of chromosome 3 is the gene encoding this enzyme located? Strain Percentage of wild-type enzyme levels in F1 progeny A 100 B 45 C 54 D 98 E 101 Between map units 30 & 40. Question 2 (10 points) (Hollingsworth) Three of the many genes in Drosophila are y (yellow body), ct (cut wings), and m (miniature wings). A heterozygote for those three genes is crossed with a homozygote recessive and the following numbers of progeny were observed: yellow, cut, mini 30 wild-type 33 yellow 10 cut, mini 12 mini 8 yellow, cut 5 yellow, mini 1 cut 1 What was the phenotype of the parents that produced the heterozygote in this cross? one was yellow body, cut wings and miniature wings The other was wild type for body color and both wing phenotypes. (one point per answer) Which gene is located between the other two? (two points) cut wing gene What was the genotype of the heterozygote in this cross? (show the genes on each chromosome) y ct m y + ct + m + (must be in correct order & correct notation) Question 3 (10 points) (Hollingsworth) Two genes located on the same chromosome are known to be 15...
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- Spring '09