BioEE 278 Fall 2007 Evolutionary Biology Lecture 8 PATTERNS OF EVOLUTION A. Phylogenetics and evolutionary history 1. Why are we interested in building trees? a. sequence of character evolution b. the environmental context of character evolution 2. Monophyly, paraphyly, polyphyly 3. Clades and cladograms B. Patterns of character evolution 1. Mosaic evolution a. taxa have both ancestral and derived features because some traits evolve slowly, others more rapidly) – avoid using “primitive” and “advanced”. 2. Evolutionary pattern a. for characters that do change, is the direction of change consistent (trend) or
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Phylogenetics, character evolution, cladograms B. Patterns