Lecture4 outline

Lecture4 outline - Phylogeny reveals history of descent....

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BIOEE 2780 Spring 2010 Evolutionary Biology and Diversity R. Harrison LECTURE 4: BUILDING TREES: ORDERING THE DIVERSITY OF LIFE Major concepts and questions: Goals of modern systematics: classification, nomenclature, phylogenetic inference. Descent with modification leads to hierarchy in patterns of variation. That hierarchy can be used to infer phylogenies (evolutionary trees), which reflect the history of descent. How are similarity and common ancestry related? How do derived and ancestral character states contribute to similarity? Is homoplasy widespread? Terminology: synapomorphy and symplesiomorphy, autapomorphy. Outline Systematics and taxonomy Classification Nomenclature Phylogenetic inference Descent with modification leads to hierarchy in patterns of variation.
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Unformatted text preview: Phylogeny reveals history of descent. Phylogenies are extended pedigrees. Similarity and common ancestry. BIOEE 2780 Lecture 4 2 Characters and character states. Need to define in order to carry out formal analysis of variation. Character is an attribute of organisms – in all of its modifications. Character state is form of a character in a particular individual. Eye color; shell color, banding. Similarity and common ancestry. Does more similar imply more closely related? Types of similarity. Homology Homoplasy Symplesiomorphy versus synapomorphy The significance of autapomorphies. Worked examples: see Figures 2.5 and 2.8 in Futuyma....
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This note was uploaded on 02/04/2010 for the course BIOEE 2780 taught by Professor Geber during the Fall '07 term at Cornell.

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Lecture4 outline - Phylogeny reveals history of descent....

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