ExamII - EXAM II GENE(BIOL)3200 February 16, 2010 Drs....

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EXAM II GENE(BIOL)3200 February 16, 2010 Drs. Bennetzen and Condie Initials _______________________ All digits of 810 number ___________________ 1 KEY KEY KEY KEY KEY KEY KEY KEY KEY KEY KEY KEY 1. (2 points) Which of the following is not one of the assumptions of the Hardy-Weinberg law? A. The population is very large. B. The fitness of all genotypes is the same. C. Mutations of the alleles do not occur. D. No migration occurs into or out of the population. E. There is non-random mating within the population. 2. (3 points) In the cross a+ b+ c+/a b c X a b c/a b c the least frequent classes of progeny were a b c+/a b c and a+ b+ c/a b c . The a, b and c genes are linked. What is the correct order of the genes? A . a b c B. c b a C. a c b D. b a c E. None of the above answers is correct. 3. (2 points) Which of the following was evidence that crossing over occurs at the 4 strand stage of meiotic prophase I. A. Meiosis in Drosophila produces 4 haploid sperm cells. B. Recombination does not occur in Drosophila males. C. Only a small fraction of yeast tetrads are NPD when two genes are linked. D. The number of NPD tetrads equals PD tetrads when two genes are not linked. E. None of the above answers is correct. 4. (2 points) Microevolution is defined as A. a process that includes new species formation. B. changes in the frequency of alleles within a population . C. evolution of microorganisms. D. interactions between species. E. All of the choices are correct.
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EXAM II GENE(BIOL)3200 February 16, 2010 Drs. Bennetzen and Condie Initials _______________________ All digits of 810 number ___________________ 2 (3 points) In humans, brachydactyly is a dominant condition. Six thousand four hundred people in a population of 10,000 show the disease (1,600 are BB, 4,800 are Bb) and 3,600 are of normal phenotype (bb). The frequency of the b allele is A. 0.6. B. 0.4. C. 0.36. D. 0.48. E. None of the above is a correct answer. (3 points) Changes in allele frequency in conditions of either natural or artificial selection depend on A. the allele frequencies themselves. B. the relative fitness related to viability. C. the reproductive abilities of the different phenotypes. D. the allele frequencies themselves, and relative fitness related to viability only. E. the allele frequencies themselves, relative fitness related to viability, and reproductive abilities of the different phenotypes. (2 points)
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ExamII - EXAM II GENE(BIOL)3200 February 16, 2010 Drs....

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