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Unformatted text preview: number reflecting the degree of similarity between different taxa. Assumes : homologous and analogous characters will be in there together, but rate of character change is roughly proportional to evolutionary distance and the homologous characters will carry the day. Results plotted in a Phenogram showing evolutionary relationships. See fig. 14.1, pg. 373, 14.4, pg. 378. Cladistics (Phylogenetic systematics) Clade is everything. Define a hierarchical series of dichotomous branching events reflecting ancestor-descendant relationships. Seeks to identify monophyletic groups that, by definition, are derived from a single common ancestor. Defines these groups as taxa sharing derived characters ( synapomorphies ). Assumes that speciation is dichotomous producing two sister taxa and that the ancestral taxon disappears at the speciation event. See handout for examples and terminology; see fig. 14.1, 14.2, 14.6, pg. 373, 376, 382....
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This note was uploaded on 11/06/2011 for the course BIO BSC1010 taught by Professor Gwenhauner during the Fall '10 term at Broward College.
- Fall '10