Exam 2_Spr17_with_answers.docx - Exam 2 Name Biology 355...

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Exam 2 Name: Biology 355 Spring, 2017 Instructions: You may use the backs of the pages for scratch paper. For your final answer, please use blue or black ink. If you need to change your answer, draw a line neatly through the old one and write in the new one. Write your name at the top of this page. You may use a calculator. Please turn off your cell phone. Do not use a cell phone, notebook computer or other computing device during the exam. Pascal’s Triangle: 1 1 1 1 2 1 1 3 3 1 1 4 6 4 1 1 5 10 10 5 1 etc. A term in the binomial expansion: n!/(s!t!) * a s b t where s + t = n; a and b are probabilities such that a + b = 1. Prob(A and B) = Prob(A) x Prob(B) if A and B are independent. Prob(A or B) = Prob(A) + Prob(B) . (This is a special case that we use in class.) χ 2 = Σ (o-e) 2 /e e = expected, o = observed and the sum is over all possible outcomes. df = degrees of freedom = n - 1 where n is the number of outcomes.
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1.) (8 pts) Suppose a woman who is a carrier for X-linked colorblindness marries a man who has X-linked colorblindness. Part a: 6 pts, including 2 for correct notation. 2 pts for part b X + is OK for wild-type. a.) What are the expected genotypes and genotypic ratios of their sons? Daughters? (For full credit you must use the correct notation for X-linked traits in humans.) C : normal allele c : colorblindness allele P X C X c x X c Y X C X c X c X C X c X c X c genotypes of daughters: X C X c , X c X c in a 1:1 ratio. Y X C Y X c Y genotypes of sons: X C Y, X c Y in a 1:1 ratio b.) What are the expected phenotypic ratios of the sons and daughters? Daughters: 1:1 normal vision to colorblind Sons: 1:1 normal vision to colorblind The phenotype of a carrier is normal. 2) (4 pts) For a person with type AB blood (genotype i A i B ), both anti-A antibodies and anti-B antibodies will clump the red blood cells. This phenomenon is an example of (circle one): A.) Incomplete dominance B.) Partial dominance C.) Codominance D.) Gain-of-function E.) Loss-of-function
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3.) (10 pts) Schmoos can be either graceful (G) or gruesome (g).
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