Exam 2_Spring16 with answers (1).docx

Exam 2_Spring16 with answers (1).docx - Exam 2 Name Biology...

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Exam 2 Name: Biology 355 Spring, 2016 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 classes of outcomes.
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1) (6 pts) A mutation in a gene often results in a reduction of the activity of the product of that gene. The term for this type of mutation is ________. A) codominance B) incomplete dominance C) loss of function D) multiple allelism E) gain of function 2.) (18 pts) In summer squash two genetic loci determine whether the fruit (squash have seeds, so they are fruit) is white, yellow or green. The dominant allele A at one locus gives white squash regardless of the alleles at locus B , ie A is epistatic on B . If the genotype is aaBB or aaBb , then the fruit is yellow. aabb gives green fruit.
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