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Unformatted text preview: Chapter 27: Phylogenies and the History of Life Tools for studying history: Phylogenetic trees How do they estimate phylogenies? How can biologists distinguish homology from homoplasty? Parsimony Phylogeny- the evolutionary history of a group of organisms is called a phylogeny. Usually summarized and depicted in the form of Phylogenetic tree. A Phylogenetic tree shows the ancestor-dependent relationships among populations or species and clarifies who is related to whom A branch represents a population through time A node is where two branches diverge, represents the point in time when when an ancestral species split into two or more descendent species A tip (terminal mode), the endpoint of a branch, represents a group, a larger taxonss that is living today or ended in extinction Phylogenetic tree is an extremely effective way of summarizing data on the evolutionary history of a group of organisms....
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This note was uploaded on 03/21/2012 for the course BIOSC 160 taught by Professor Coffman during the Spring '10 term at Pittsburgh.
- Spring '10