131106outline13 - Biol 1311 Phylogeny principles A phylogeny of hemoglobins just what does it mean and what are the rules to create one Phylogenies

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Biol. 1311 – 9/27/06 – Phylogeny principles A phylogeny of hemoglobins – just what does it mean and what are the rules to create one? Phylogenies and the history a species or a gene What patterns can be discerned as species appeared and disappeared over the course of history? Why do those patterns exist? Species concept underpins phylogenies (fig 25-1) Species concept approaches (Tab. 25-2) Phylogenies we’ve looked at: Everything; Fungi and porphyrins again; Phylogeny of circulatory systems Defining the term The evolutionary history of a group of organisms is called a phylogeny . A phylogenetic tree shows ancestor-descendant relationships among evolutionary groups (usually species or populations but also genes). Any phylogeny is a hypothesis Your text calls the process “estimation” Phylogenies are constructed based on a limited number of traits (even if these traits are DNA sequences) Each time a new organism has the state of its traits defined, and so can be incorporated into an existing phylogeny, this is a test of the phylogeny’s accuracy. Ditto when a new trait is added to an existing phylogeny
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This note was uploaded on 01/24/2010 for the course BIO 1311 taught by Professor Shinkle during the Fall '06 term at Trinity University.

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131106outline13 - Biol 1311 Phylogeny principles A phylogeny of hemoglobins just what does it mean and what are the rules to create one Phylogenies

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