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Test__20889[2] - Print Test...

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Print Test https://www.casa.uh.edu/CourseWare/Root/UsersStudents/PrintTest.htm 1 of 9 4/22/07 2:30 PM PRINTABLE VERSION Test 2 You scored 95 out of 100 Question 1 Your answer is CORRECT. Humans exhibit hand preference for most manual activities in which they are specialized. Right- and left-handers have coexisted at least since the Upper Palaeolithic, and left-handers are in the minority in all human populations. The persistence of the polymorphism of handedness is a puzzle because this trait is heritable and several fitness costs are associated with left-handedness. One hypothesis is that left-handers have an advantage in fights when they are rare, as both left- and right-handers are less familiar with that kind of opponent. Which evolutionary mechanism is invoked in this hypothesis? a) Adaptive landscape b) Wahlund effect c) Spatial variation in fitness d) Mutation/selection balance e) Frequency-dependent selection Question 2 Your answer is CORRECT. There are two alleles of alcohol dehydrogenase ( Adh ) in a population of Drosophila melanogaster : F and S. In laboratory experiments carried out at a stressfully high temperature, the three genotypes are shown to have the following viabilities (i.e., probability of survival from egg to adult): 46% FF, 60% FS, and 32% SS. A population is set up in the laboratory with an initial frequency of F of p =0.5. Which of the following responses (A-D) would you expect to represent the evolution of this experimental population? (Note: in all cases depicted, the fitnesses of FF and SS homozygotes differ by 30%, although not necessarily in the same direction.)
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Print Test https://www.casa.uh.edu/CourseWare/Root/UsersStudents/PrintTest.htm 2 of 9 4/22/07 2:30 PM a) A and D b) C c) A d) D e) B Question 3 Your answer is CORRECT. Heterozygote advantage causes the population to converge on an intermediate allele frequency
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Print Test https://www.casa.uh.edu/CourseWare/Root/UsersStudents/PrintTest.htm 3 of 9 4/22/07 2:30 PM Which of the following statements about the role of randomness in evolution is correct? a) Evolution is less random in small populations than in large populations because genetic drift plays a more important role in small populations b) Evolution is more random in small populations than in large populations because genetic drift plays a more important role in small populations c) Evolution is completely nonrandom because natural selection is nonrandom d) Evolution is more random in small populations than in large populations because natural selection plays a more important role in small populations e) Evolution is less random in small populations than in large populations because natural selection plays a more important role in small populations Question 4 Your answer is CORRECT. A population of the land snail Cepaea vindobonensis shows variation in the intensity of its shell pigmentation determined by one locus with two alleles, S and s: SS and Ss individuals have dark shells, whereas ss individuals have light shells. Dark
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