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PS05-sol - Genetics 320 Problem Set Five Solutions 1(2...

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Genetics 320 Problem Set Five Solutions 1. (2 points) : 1000 linear tetrads from A/a are scored, and the following numbers are observed: linear tetrad number seen aaAA 390 aAaA 90 AAaa 410 AaaA 110 (a) What is the frequency of first division segregation? Of second division segregation? Freq(1st) = (390+410)/1000 = 0.8, Freq(2nd) = (90+110)/1000 = 0.2 (b) What is the recombination frequency between the A locus and the centromere? locus-centromere recombination frequency = (1/2)* Freq(2nd Divs seg) = (1/2)* 0.2 = 0.1 2. (3 points) : Consider unordered tetrads from the cross Ab/aB , where the tetrads were tetrad members number seen Ab, aB, ab, AB 138 tetratype ab, ab, AB, AB 12 nonparental Ab, Ab, aB, aB 150 parental (a) Identify the parental, nonparental, and tetratypes. (b) What is the recombination fraction between the A and B loci? (1 / 2) T + NPD T + NPD + P = (1 / 2)138 + 12 138 + 12 + 150 = 0 . 27 3. (5 points) : In a cross of cr + al × cr al + , 100 ordered tetrads were scored. These fell into the following five types (Labled A - F), with the numbers observed given below the label. Tetrad A Tetrad B Tetrad C
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