EXAM II GENE(BIOL)3200 February 16, 2010 Drs. Bennetzen and CondieInitials_______________________ All digits of 810 number___________________ 1KEY 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 cX a b c/a b cthe least frequent classes of progeny were a b c+/a b cand 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 cB. c b aC. 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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