1Biology 171 Exam 3 Winter 2009 MC ANSWER KEY FORM 1 Multiple-choice Question Answer Key 1. B. 0.5 2. B. all or most of the genetic variation for these traits has been eliminated. 3. D. evolve under similar selective pressures. 4. D. the average value for the trait stays approximately the same, but the genetic variation for the trait decreases. 5. D. results in an increased number of sets of chromosomes. 6. B. eukaryotic. 7. A. It infects red blood cells. 8. A. they take place on different time scales. 9. C 10. C. A population of beetles becomes stranded on an island that previously lacked any beetle species. 11. D. small subunit of ribosomal RNA gene / can’t be placed in this phylogeny as viruses don’t have this gene 12. E. all of the above can happen 13. C. sympatric speciation/ intersexual selection 14. E. A & C 15. A. brightly-colored males have “good genes” 16. A. guppies became larger over time because small predators are less of a threat to big fish 17. C. stabilizing selection on ferret body size 18. B. E, F, and G 19. C. the evolution of prokaryotic life 20. B. only enveloped viruses are surrounded by a host-derived membrane 21. D. precipitated iron oxide in the oceans 22. A. the vertebral column is a synapomorphy of vertebrates but not the lancelet 23. C. 0.04 24. E. all of the above 25. D. photoheterotroph 26. C. incorporate their genetic material into that of their host 27. E. Two closely-related species of Anophelesmosquito can mate but cannot produce fertile progeny because they have different chromosome structures 28. E. Bacteria capture nitrogen gas and convert it into ammonium 29. E. None of the above. 30. B. Choanoflagellates
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