Lecture Notes8

238 222 222 classification should reflect phylogeny p

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Unformatted text preview: 238; 222) 222 Classification should reflect phylogeny p. 238; 223): Classification p. 223 Monopyletic groups (one evolutionary lineage) Polyphyletic groups (several evolutionary lineages) Paraphyletic group (part of lineage excluded). Ideally, all groups should be monophyletic. Phylogenetic trees to display relationships. Modern Methods to Uncover Phylogeny to Cladistics: method for comparing organisms to determine relationships based on shared derived characters (p. 239; 225). 225 shared Characters considered: morpology, molecular, etc. Outgroups of more distantly-related taxa help distinguish preexisting (ancestral) features from distinguish features derived ones unique to only a certain group. derived Goal: recover branching pattern of evolution. Goal: Product: cladogram (tree diagram). Product: cladogram When >1 trees explain the data? Choose the simplest When “Parsimony”. Mosses Clubmosses Ferns Pines Oaks A Cladogram Classification of Organisms (P. 244) Classification Domains Bacteria, Archaea, & Euka...
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This document was uploaded on 03/28/2014 for the course BIO 131 at SFASU.

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