BIO 325 - Fall 2007 - TTh 200 to 330 - Quiz IV

BIO 325 - Fall 2007 - TTh 200 to 330 - Quiz IV - IV Quiz 1....

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GENETICS (BIO 325) Fall 2007 T, Th 2:00 – 3:30 PM IV Quiz 10/16/07 Total points: 16 __________________________________________________________________________________________________ 1. Five Hfr strains of E. coli (strains 1 - 5) were obtained from an F + strain carrying the wild-type alleles of the genes a, b, c, d, e, and f. Each Hfr strain was mated individually to the same F - strain (carrying the recessive alleles of all genes). With interrupted mating, the times of first appearance in minutes of individual Hfr markers in exconjugants were determined, as shown in the following chart: (8 points) Minutes Hfr marker Hfr 1 Hfr 2 Hfr 3 Hfr 4 Hfr 5 a + 16 2 20 b + 9 11 c + 12 28 10 d + 56 42 5 e + 35 50 f + 88 35 On a single 100-minute map, show (a) the positions of genes a, b, c, d, e, f, (b) the origin of transfer of the Hfr chromosome for each Hfr strain, (c) the orientation of the origins, and (d) the distance between adjacent genes. 2.
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BIO 325 - Fall 2007 - TTh 200 to 330 - Quiz IV - IV Quiz 1....

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