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Unformatted text preview: Homoplasic traits B. Homoplasies can create misleading phylogenies V. Phylogenetic groups A. Monophyletic group consisting of ancestor and ALL descendants (i.e. a clade) a clade is at each node B. Paraphyletic group consisting of ancestor and MOST descendants, missing some descendants because some might have gone extinct VI. Molecular Clocks A. Technique used to relate molecular differences between two lineages to their absolute time since divergence B. Assumes constant mutation rate VI. Modern use of Phylogenies A. Reveal changes not captured by the fossil record-helps us understand how things evolved over time (i.e. brains cant are hard to be fossilized because it is soft tissue B. Resolve evolutionary hypotheses (i.e. what came first lung or swim bladders) C. Identify illegal activity Lecture Outline 6 Phylogeny and Systematics II D. Track the origins and spread of infectious disease 1. HIV 2. Bird flu 3. West Nile Virus...
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This note was uploaded on 08/19/2011 for the course BSC 2010 taught by Professor Thomas during the Spring '07 term at University of Central Florida.
- Spring '07