Chapter 25 Tracing Phylogeny
Objectives
| Phylogenies are Based on Common Ancestries | |||
| 1. | Distinguish between phylogeny and systematics. | ||
| 2. | Describe the process of sedimentation and the formation of fossils. Explain which portions of organisms are most likely to fossilize. | ||
| 3. | Explain why it is crucial to distinguish between homology and analogy before selecting characters to use in the reconstruction of phylogeny. | ||
| 4. | Explain why bird and bat wings are homologous as vertebrate forelimbs but analogous as wings. | ||
| 5. | Define molecular systematics. Explain some of the problems that systematists may face in carrying out molecular comparisons of nucleic acids. | ||
| Phylogenetic
Systematics: Connecting Classification with Evolutionary History |
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| 6. | Explain the following
characteristics of the Linnaean system of classification: a. binomial nomenclature b. hierarchical classification |
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| 7. | List the major taxonomic categories from most to least inclusive. | ||
| 8. | Define a clade. Distinguish between a monophyletic clade and paraphyletic and polyphyletic groupings of species. | ||
| 9. | Distinguish between shared primitive characters and shared derived characters. | ||
| 10. | Explain how shared derived characters can be used to construct a phylogenetic diagram. | ||
| 11. | Explain how outgroup comparison can be used to distinguish between shared primitive characters and shared derived characters. | ||
| 12. | Define an ingroup. | ||
| 13. | Distinguish between a phylogram and an ultrameric tree. | ||
| 14. | Discuss how systematists use the principles of maximum parsimony and maximum likelihood in reconstructing phylogenies. | ||
| 15. | Explain why any phylogenetic diagram represents a hypothesis about evolutionary relationships among organisms. | ||
| 16. | Distinguish between orthologous and paralogous genes. Explain how gene duplication has led to families of paralogous genes. | ||
| 17. | Explain how molecular clocks are used to determine the approximate time of key evolutionary events. Explain how molecular clocks are calibrated in actual time. | ||
| 18. | Describe some of the limitations of molecular clocks. | ||
| 19. | Explain the neutral theory of evolutionary change. | ||
| 20. | Explain how scientists determined the approximate time when HIV-1 M first infected humans. | ||
| 21. | Describe the evidence that suggests there is a universal tree of life. | ||
