07-03-08

- Ch 25 Phylogeny and Systematics A Phylogeny the evolutionary history of species or group of related species B Systematics an analytical approach

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07-03-08 Ch. 25 Phylogeny and Systematics A. Phylogeny: the evolutionary history of species or group of related species B. Systematics: an analytical approach to understanding the diversity and relationships of organisms a. Morphological, biological, and molecular comparisons used to infer relationships C. Morphological and molecular homologies a. Phylogenetic history can be inferred from certain morphological and molecular similarities among organisms b. Generally i. Similar morphology and DNA sequences = closely related species D. But, beware of analogous structures or molecular sequences ( aka homoplasies) a. Similarity may be due to convergent evolution (analogy) not shared ancestry (homology) E. Evaluating Molecular homologies a. Fig. 25.6 (homologous DNA) and 25.7 (homoplasy) F. Concept 25.2: Phylogenetic systematics connects classification with evolutionary history a. Taxonomy: the ordered division of organisms into categories used to asses similarities and differences G. Binomial nomenclature
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This note was uploaded on 07/21/2008 for the course BIOL 1202 taught by Professor Gregg during the Summer '08 term at LSU.

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- Ch 25 Phylogeny and Systematics A Phylogeny the evolutionary history of species or group of related species B Systematics an analytical approach

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