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Unformatted text preview: 238; 222)
Classification should reflect phylogeny p. 238; 223):
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
Cladistics: method for comparing organisms to determine
relationships based on shared derived characters (p. 239; 225).
shared Characters considered: morpology, molecular, etc. Outgroups of more distantly-related taxa help
distinguish preexisting (ancestral) features from
derived ones unique to only a certain group.
Goal: recover branching pattern of evolution.
Product: cladogram (tree diagram).
Product: cladogram When >1 trees explain the data? Choose the simplest
Mosses Clubmosses Ferns Pines Oaks A Cladogram Classification of Organisms (P. 244)
Domains Bacteria, Archaea, & Euka...
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This document was uploaded on 03/28/2014 for the course BIO 131 at SFASU.
- Spring '14