Can anyone tell me how to do number 1? I know the answer is b but I don\'t know

Question

Can anyone tell me how to do number 1? I know the answer is b but I don't know how you know to pull the numbers (5,8,3) and I don't know the formula?

Exam #2-Gene 301, July 16, 2010, Name Instructions: There are 25 questions on the exam written on both sides of one page. Answer all questions in the space provided to the right. You may have a calculator, 1 sheet of notes, and scratch paper for the exem. 1. Consider the following data derived from a cross of a haploid, wild-type Neurospora with a has black (b) spores and white (w) mycelium. The following ordered tetrads of sexual spores resulited haploid strain tha 33.325 5 9 3 Total 100 What is the map distance botween the black spores' locus and its centromere? 2. What is the map distance between the white mycelium" locus and its centromere? 3. What is the map distance between the black and white loci? a. 14 c. 16 e. 12 5154A+ a. 9.5 b. 22 C. d. 20 e. 6.5 a. 19 b. 18 c. 16 d. 49.5 e. not linked 4. The locus for black body (b) and the locus for purple eyes (pr) are separated by 13 map units on chromosome-2. The locus for curved wings (cu) is 10 map units from purple eyes, and the order of loci is blac purpie and curved. The coefficient of coincidence is 0.6. A female Drosophila that is homozygous for black purple is crossed with a homozygous curved male. An F1 female from this cross is test-cross frequency would you expect to find a phenotypically b pr cu fly among the test-crossed progeny? ed. At what d 00932 e. 0.0039

Explanation / Answer

The formula is (no of second octads/total number of octads)*100 then divide the answer by 2

32/100*100=32/2=16 answer

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