Chapter 25

Chapter 25 - Chapter 25 Phylogeny and Systematics January...

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Chapter 25 Phylogeny and Systematics – January 28, 2008 1) Phylogeny: the evolutionary history of a species or group of related species 2) Systematics: an analytical approach to understanding the diversity and relationships of organisms a. Morphological, biochemical, and molecular comparisons used to infer relationships January 30, 2008 3) Morphological and Molecular Homologies a. Phylogenetic history can be inferred from certain morphological and molecular similarities among organisms b. Generally, similar morphology and similar DNA sequences = closely related species c. But, beware of analogous structures or molecular sequences (a.k.a. homoplasies) i. Similarity may be due to convergent evolution (analogy), not shared ancestry (homology) 4) Phylogenetic systematics connects classification with evolutionary history a. Taxonomy: the ordered division of organisms into categories based on a set of characteristics used to asses similarities and differences 5) Binomial Nomenclature a. The two part format of the scientific name of an organism
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This note was uploaded on 02/04/2009 for the course BIOL 1202 taught by Professor Gregg during the Spring '08 term at LSU.

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Chapter 25 - Chapter 25 Phylogeny and Systematics January...

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