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Western University
Biology 1001A
Felix Lee

Biology 1001A Sample Questions Final Exam 2012 The following questions were selected from previous tests to illustrat e several styles of questioning you might expect in this course. This collection is not a “practice exam”; it has not been balanced to represent the length, topic coverage nor difficulty of the coming Final Exam. Answers will be posted on Thursday, December 6. In the meantime, discuss your answers in study groups and come to a consensus. 1. How does sustained directional selection affect the amount of genetic variation within a population? A. The amount of genetic variation increases. B. The amount of genetic variation decreases. C. The amount of genetic variation stays the same. 2. Imagine a population of raccoons in which food -washing behaviour is controlled by the W locus. WW individuals wash their food thoroughly before eating; Ww individuals wash their food less thoroughly; and ww individuals never wash their food. After observing 1000 raccoons, you count 300 WW, 200 Ww and 500 ww individuals. What is the frequency of the w allele for this population? A. 0.36 B. 0.5 C. 0.6 D. 0.7 E. Because the population is not in Hardy -Weinberg equilibrium at the W locus, it is imp ossible to calculate the frequency of w. 3. Western’s mascot is a wild horse called a mustang. Imagine that fur colour in mustangs is controlled by the R locus: RR individuals are red, Rr individuals are purple, and rr individuals are blue. In a population of 100 mustangs, you count 5 red, 90 purple and 5 blue individuals. Which of the following is a likely explanation? A. Fitness is not related to fur colour. B. This locus works by blending inheritance. C. R and r are equally frequent, so the popula tion is in Hardy-Weinberg equilibrium. D. The population is extremely inbred. E. This locus shows heterozygote advantage (overdominance). 4. Which of the following processes is most likely to increase the frequency of homozygotes in a population? A. genetic drift B. disassortative mating C. overdominance D. negative frequency-dependent selection E. migration Biology 1001A Sample Questions Final Exam 2012 5. What is/are the major genetic effect(s) of inbreeding on a population? 1. It increases the frequency of harmful alleles. 2. It increases the frequency of recessive alleles. 3. It increases the mutation rate. 4. It decreases the proportion of individuals that are heterozygous. A. 1, 2 and 3 B. 1 and 3 C. 2 and 4 D. 4 only E. 1, 2, 3 and 4 are correct 6. According to sexual selection theory, whe n should females compete for mates more intensely than males do? A. Whenever females have higher average fitness than males. B. Whenever females have higher potential fitness than males. C. Whenever females have lower average fitness than males. D. Whenever females have lower potential fitness than males. E. Females should never compete for mates more intensely than males do. 7. Which of the following accurately describe sexual selection in humans? 1. Males and females are both very choosy when sele cting short-term mating partners. 2. Males and females are both very choosy when selecting long-term mating partners. 3. Males and females have very similar potential fitness. 4. Males and females have very similar average fitness. A. 1, 2 and 3 B. 1 and 3 C. 2 and 4 D. 4 only E. 1, 2, 3 and 4 are correct 8. According to the “ruby in the rubbish” hypothesis, which of the following is an important advantage of sex? A. Sex increases the rate of helpful mutations and decreases the rate of harmful mutations. B. Sex preserves adaptations to a stable environment. C. Sex increases the chance that at least some offspring will have fewer harmful mutations than their parents. D. Sex reduces the mutation rate. 9. For what type of population is the Biological Specie s Concept most useful? A. Populations that are extinct. B. Populations that are allopatric. C. Populations that are sympatric. D. Populations that reproduce asexually. Biology 1001A Sample Questions Final Exam 2012 10. Which of the following examples represe
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