lecture06 - BioEE 278 Evolutionary Biology Fall 2007...

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1 BioEE 278 Fall 2007 Evolutionary Biology Lecture 6 PHYLOGENETICS I ORDERING THE DIVERSITY OF LIFE Ch. 2, Ignore Box 2B A. What is systematics? 1. The scientific study of the diversity of organisms. 2. Goals of modern systematics. a. identification and classification: variation is not continuous – appears to come in "discrete" units (e.g., species). b. nomenclature (naming of taxa). c. determine evolutionary relationships (phylogeny). B. The nature of variation 1. Hierarchy in patterns of variation. a. descent with modification should lead to hierarchy. b. categories and taxa (singular: taxon ). 2. Characters and character states. a. intuitive clustering based on morphology. b. importance of other sorts of characters (e.g., DNA sequence data). 3. The causes of similarity. a. similarity and relatedness. b. "more similar" does not necessarily mean more closely related. c. homology - similarity due to common ancestry. d.
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lecture06 - BioEE 278 Evolutionary Biology Fall 2007...

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