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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? ________________________________ 2. A small, captive breeding program for rhinos in a zoo has only 8 individuals. What assumption of Hardy-Weinberg does this population violate? _________________________________________________ 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.) _________________________________________________ 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 6. There are two flower color alleles at a particular locus in the Irish flag-flower. One homozygote had green flowers, the other homozygote has orange flowers, and the heterozygote has white flowers. If you had to choose from among the following terms for the way the genotypes produce the phenotypes in this species, which would be the best description? a.
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This test prep was uploaded on 04/18/2008 for the course BIOL_SCI 164 taught by Professor Walsh during the Spring '08 term at Northwestern.

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