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EXAM2_Practice_Problems

EXAM2_Practice_Problems - BLY302 FALL 2010 PRACTICE...

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BLY302 FALL 2010 PRACTICE PROBLEMS FOR EXAM 2 Q1 If the recombination frequency between genes ( A ) and ( B ) is 5.3%, what is the distance between the genes in map units on the linkage map? Q2 Assume that the coefficient of coincidence (CC) for a map distance of 24 cM = 0.25. Consider the following 3-factor (trihybrid) testcross: + + c (x) abc/abc a b + 10.6 cM 13.4 cM Calculate the number of progeny in each phenotype class (parentals, SCOs, and DCOs) resulting from this cross. Base your calculations on a total of 1000 progeny. Hint: The actual frequency of double-crossover progeny can be determined by multiplying the frequencies of recombination for each single crossover together (to calculate expected DCOs), and then multiplying that product by the coefficient of coincidence for the known map distance between the alleles (to calculate the actual, observed DCOs). Q3 You are studying 3 genes X, Y, and Z that are linked (in that order) in the Imperial Scorpion Pandinus imperator .
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EXAM2_Practice_Problems - BLY302 FALL 2010 PRACTICE...

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