320202002LS4Lec220final20Key20D

320202002LS4Lec220final20Key20D - LS4 Lec2 Final Exam...

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1 LS4 Lec2 Final Exam 3/21/2002 ____ Key __________ _________________ _________________ ________________ Last name First name Student ID Disc. Section 1 ______________ 6 ______________ 11 _____________ 16 ______________ 2 ______________ 7 ______________ 12 _____________ 17 ______________ 3 ______________ 8 ______________ 13 _____________ 18 ______________ 4 ______________ 9 ______________ 14 _____________ 19 ______________ 5 ______________ 10 _____________ 15 _____________ Total __________________ Discussion __________________ Midterm 1 ________ __________________ Midterm 2 ________ __________________ Midterm 3 ________ __________________ Quarter total score __________________ Quarter grade __________________ Show All Your Work for Full Credit.
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2 1. 15 pts A test cross of a tri-hybrid (the F1) gave these results (the F2): all wild type 24 dumpy wings 34 hooked bristles 26 purple eyes 16 16 24 hooked bristles & purple eyes 34 26 200 a. What were the genotypes of the purebred P generation parents that created the F1? Dp x hk pr b. Determine the map of these traits and the distances that separate the markers. dp + + dp hk pr 41 m.u 41 m.u. + hk pr 24 26 16 16 16 16 26 24 82 82 c. What is the length of this linkage group? 82 m.u. 2. 10 pts. One in 10 males in the US has some form of X-linked recessive colorblindness. a. What is the colorblind allele frequency in the US population? 10% b. What is the expected proportion of females with normal color vision? 99%
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3 3. 15 pts. Flowers of a plant species can be scarlet, red, pink, coral or white. A series of crosses between plants produced the following results: Cross Parental phenotypes Progeny 1 scarlet x red all scarlet 2 scarlet x scarlet 76 scarlet, 25 pink a. red x red 86 red, 29 pink b. scarlet x pink 49 scarlet, 52 pink c. scarlet x scarlet 69 scarlet, 22 red d. scarlet x red 50 scarlet, 51 red e. scarlet x red 54 scarlet, 26 red, 25 pink f. pink x pink all pink g. scarlet x red 49 scarlet, 25 red, 23 coral h. coral x coral 60 coral, 29 pink, 31 white i. pink x white all coral j. white x white all white k. scarlet x white all scarlet a. How many genes are involved in the inheritance of flower color in this plant? 1 (S > r > p = w) b. Indicate all possible genotypes for the following phenotypes, scarlet- SS, Sr, Sp, Sw red- rr, rp, rw pink pp coral- pw white- ww 4. 10 pts. Gene X has three alleles X 1 , X 2 and X 3 with frequecies of 0.6, 0.3 and 0.1 in the population, respectively. Given random mating, calculate the combined frequency of all heterozygotes in the population. 1 - (0.6) 2 - (0.3) 2 - (0.1) 2 = 1 - 0.36 - 0.09 - 0.01 = 0.54 or 2 x 0.6 x 0.3 + 2 x (0.6) x 0.1 + 2 x 0.3 x 0.1 = 0.36 + 0.12 + 0.06 = 0.54
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4 5. 15 pts. In the mushroom species kilumded, cap color is determined by four independently segregating alleles A, B, C, and D. Loss-of-function mutations in any of these genes result in the inability to synthesize pigment as diagramed below:
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320202002LS4Lec220final20Key20D - LS4 Lec2 Final Exam...

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