Exam 2 ZUFALL - PRINTABLE VERSION Test 2 You scored 95 out...

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PRINTABLE VERSION Test 2 You scored 95 out of 100 Question 1 Your answer is CORRECT. The graph below shows the change in allele frequency, p, over 100 generations of selection. At generation 0, p=0.1. The red and blue lines represent evolution in two populations experiencing two different selective scenarios. Which statement best describes the difference between the red and blue scenarios? a) The red line shows a deleterious recessive allele; the blue line shows a deleterious dominant allele. b) The red line shows heterozygote advantage; the blue line shows a beneficial recessive allele. c) The absolute fitnesses in the blue population are higher than the absolute fitnesses in the red population. d) The blue line shows a stable equilibrium; the red line shows an unstable equilibrium. e) The blue line shows the effects of natural selection; the red line shows the effects of genetic drift. Question 2 Your answer is CORRECT.
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The graph below shows the change in allele frequency, p, over 100 generations. Each color represents an independent population. At generation 0, p=0.5. Which of the following statements most accurately describes processes occurring in these populations? a) Genetic drift is randomly changing allele frequencies. b) Some populations are experiencing natural selection and others are experiencing genetic drift. c) Heterozygotes have the highest fitness. d) Natural selection is driving some alleles to fixation and others to loss. e) These populations are becoming adapted to their current environment. Question 3 Your answer is CORRECT. Flower color in morning glories (Ipomoea purpurea) is determined by two alleles at a locus. The allele for purple color is dominant to the allele for white color. In a population that is in Hardy-Weinberg equilibrium, we count 32 out of 200 individuals that have white flowers. What percentage of the population is expected to be heterozygous for flower color? a) 48% b) 16% c) 50%
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d) 68% e) 36% Question 4 Your answer is CORRECT. The Afrikaaner population of South Africa form a relatively closed population descended from a small number of Dutch immigrants. The Afrikaaner display unusually high frequencies of mutations that cause a number of otherwise rare inherited disorders, such as sclerosteosis, a bone development disorder. This is an example of which evolutionary phenomenon? a) Frequency-dependent selection b) Mutation-selection balance c) Founder effect d) Heterozygous advantage e) Heterozygous disadvantage Question 5 Your answer is CORRECT. MN blood group is determined by a single locus with two alleles, M and N. A population of 1000 was
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This note was uploaded on 07/27/2011 for the course BIOL 3306 taught by Professor Zufall during the Spring '09 term at University of Houston.

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Exam 2 ZUFALL - PRINTABLE VERSION Test 2 You scored 95 out...

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