practice exam 3 answer

practice exam 3 answer - Exam III answer key MULTIPLE...

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Exam III answer key MULTIPLE CHOICE 1. c 2. d 3. b 4. b 5. c 6. a 7. e 8. e 9. c 10. b 11. poorly worded question – a, b or c could be correct 12. e 13. d 14. d 15. d 16. c 17. a 18. d 19. c 20. b 21. d 22. a 23. c 24. d 25. a 26. b (sorry for the duplication) 27. d 28. a 29. b 30. d
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31. Peter and Rosemary Grant have studied the finches of the Galapagos Islands for many years. In 1977, a drought resulted in severe mortality of medium ground finches on Daphne Major island. The above graphs, shown in lecture, illustrate beak depths in the population before and after the drought. a) Describe how the population changed, with respect to beak depth between 1976 and 1978. (2) BEAK DEPTH INCREASED b) If this change were to be attributable to natural selection, what type(s) of selection would be best describe the process? (2) DIRECTIONAL SELECTION c) When Charles Darwin visited the Galapagos Islands some 140 years before the Grants’ study, he also observed variation in the bird populations, and he knew from his own observations breeding pigeons that some of this variation was heritable. Darwin was also aware of the observations of the economist, Thomas Malthus. Describe Malthus’ observations and how they would apply to natural populations. (2)
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MALTHUS OBSERVED THAT POPULATIONS INCREASE FASTER THAN THEIR FOOD SUPPLIES (POPULATIONS INCREASED GEOMETRICALLY WHILE FOOD SUPPLIES INCREASED ARITHMETICALLY). THIS LEADS TO A “STRUGGLE FOR EXISTENCE” WHERE NOT ALL INDIVUDALS WILL SURVIVE TO REPRODUCE. d) From his observations of heritable variation and Malthus’ observations, describe the two logical inferences Darwin (and Wallace, independently) made to develop the theory of evolution by natural selection. (4) 1. INDIVIDUALS WITH CERTAIN HERITABLE TRAITS HAVE A BETTER LIKLIHOOD OF SURVIVING AND HAVING MORE OFFSPRING (I.E. HAVE HIGHER FITNESS) THAN OTHERS NOT EXHIBITING THESE TRAITS. 2. OVER TIME, INDIVIDUALS WITH THOSE TRAITS HAVE MORE OFFSPRING, AND THE TRAIT BECOMES MORE COMMON IN THE POPULATION (I.E. THE POPULATION EVOLVES).
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32. This experiment, described in lecture and your textbook was designed to test aspects of sexual selection in zebra finches. a) Describe the results of this experiment with respect to the relative fitness of males in the experimental and control groups when allowed to compete for females (2).
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This note was uploaded on 01/16/2012 for the course BIO 171 taught by Professor Josephinekurdziel during the Fall '08 term at University of Michigan.

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practice exam 3 answer - Exam III answer key MULTIPLE...

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