Exam 3 2009 Answer KEY

Exam 3 2009 Answer KEY - Biology 171 Exam 3 Winter 2009 MC...

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1 Biology 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 Anopheles mosquito 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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2 Biology 171 Exam 3 Winter 2009 SHORT ANSWER KEY Answers in Bold Blue Font. NOTE: This year, you were already tested on details of sexual selection on exam 2. SA 1 . In seahorses (a type of marine fish), females are brightly colored while males have colors that match the seagrass habitats where the species lives. Females deposit their eggs inside the male’s brood pouch and males fertilize the eggs. Once fertilization is completed, the females leave to court new mates and the male parent provides all the parental care – this includes taking care of the developing embryos in his brood pouch until the juvenile seahorses are ready to leave the brood pouch and for a short time after birth. (10 pts total, parts A through E) A) What is sexual dimorphism and is it present in this species? Explain . (2 pt.) Sexual dimorphism means that the sexes differ in morphological and/or behavioral traits that are used in attracting and/or obtaining mates. Yes, sexual dimorphism is present in this seahorse species as females have bright coloration whereas males have drab coloration. B)
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Exam 3 2009 Answer KEY - Biology 171 Exam 3 Winter 2009 MC...

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