Practice questions for BIO 340 Exam 2 Spring 2019 (1).docx - Practice questions for BIO 340(Exam 2 Note We will be discussing these questions during

Practice questions for BIO 340 Exam 2 Spring 2019 (1).docx...

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Practice questions for BIO 340 (Exam 2) Note: We will be discussing these questions during office hours on Wednesday February 6 from 10:30 am-12:00 pm. To join the meeting: 1. Wild type blue-eyed mary has blue flowers. Two genes control the pathway that makes the blue pigment: The product of gene W turns a white precursor into magenta pigment . The product of gene M turns the magenta pigment into blue pigment. Each gene has a recessive loss-of-function allele: w and m , respectively. A double heterozygote ( Ww Mm ) is self-pollinated. What proportion of offspring will be magenta ? Convert phenotype into genotype What proportion of WwMm x WwMm off spring will be W-mm Create two punnet squares First one is Ww x Ww and second one is Mm x Mm Frist one is ¾ WW or Ww Looking for homozygous recessive in second punnet square Second one is ¼ ww ¾ x ¼ = 3/16 2. For the following recombination frequencies of 7 gene loci ( a, b, c, d, e, f, and g ), determine linkage groups, the order of the loci in each linkage group, and the distance between the loci of each group. Loci Recombination Frequency Loci Recombination Frequency Loci Recombination Frequency Loci Recombination Frequency a and b 0.50 b and c 0.10 c and d 0.50 d and f 0.50 a and c 0.50 b and d 0.50 c and e 0.28 d and g 0.08 a and d 0.12 b and e 0.18 c and f 0.50 e and f 0.50 a and e 0.50 b and f 0.50 c and g 0.50 e and g 0.50 a and f 0.50 b and g 0.50 d and e 0.50 f and g 0.50 a and g 0.04 50% recombination frequency means that the genes are in different chromosomes or faraway from each other. Look for numbers less than .5 A and d = .12 A and g = .04 **hint that g is going to be closer to a Between a and g is 0.04= 4 cM, between G and D is 0.08 = 8 cM. A and D is 12 cM or .12 A G D B and C B and e
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C B E Between C and B there is 10 cM, between B and E there is 18 cM, between C and E is 28 cM F is on its own Don’t forget to convert into cM because it’ll be multiple choice no math needed just look at chart If its .5 or above do not group them together 3. A species has n=4 chromosomes. Genes on different chromosomes have a recombination rate of . . . .
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