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2 ND E XAM , BIOL 164, G ENETICS , E VOLUTION S OCIETY , S PRING 2007 NAME (Last/Family Name First): ________________________________ Signature: ________________________________ Student ID Number: ________________________________ Instructions : Circle the correct answer, or circle the letter corresponding to the correct answer, or write in the correct answer, as appropriate. In all cases, write legibly; answers that I cannot read will be considered incorrect. All questions are of equal point value. Good luck! ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ 1. A population of pea plants has two flower color alleles, red and white. Red is dominant to white. What is the frequency of red flower alleles in a population of 1,000 pea plants in Hardy-Weinberg equilibrium, if there are 160 pea plants with white flowers? ______________ q 2 = 0.16, so white, q, = 0.4, and red, p, = 0.6.__________________ 2. A small, captive breeding program for rhinos in a zoo has only 8 individuals. What assumption of Hardy-Weinberg does this population violate? Infinite population size (inbreeding/random mating also accepted) _________________________________________________ 3. For mutant alleles (i.e., those that have amino acid substitutions), natural selection guarantees that the beneficial alleles and the deleterious (harmful) alleles found in populations will most often be of what types? a. Dominant and dominant, respectively. b. Dominant and recessive, respectively. c. Recessive and dominant, respectively. d. Recessive and recessive, respectively.
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4. You are a CSI on your way to court to testify. Your boss tells you that the suspect in the case is a homozygote at locus X and is a match to a sample at the crime scene, but then his cell phone loses contact with yours. You are familiar with locus X, and know it has 3 alleles; the frequencies are, p = 0.7, q = 0.2, and r = 0.1. What are the chances of sampling a homozygote from the general population at locus X? (Assume people are a random mating population.) ____ p 2 + q 2 + r 2 = (0.7*0.7)+(0.2*0.2)+(0.1*0.1) = 0.54_____ (“pqr” is not a diploid genotype!) 5. For some trait in a particular plant species, say number of leaves per branch, in which population would you expect to measure higher heritability - a population raised in a carefully controlled greenhouse or a wild population inhabiting an edge habitat between a forest and a field? Greenhouse Wild The greenhouse population, because there is less environmental variation. 6.
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