b112_Lecture_25

b112_Lecture_25 - 2/1/2008 Taxonomy:MakingSenseofAllthe...

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2/1/2008 1 BIOL 112–Chapter 25 Tracing Phylogeny Taxonomy: Making Sense of All the Species Putting names to all the species, binomial nomenclature. Classifying all the species. Putting species into phylogenies Homology vs. Analogy Traits derived from a common ancestor are said to be homologous. Traits that appear to be similar, but which were derived from different ancestors, are analogous and are called convergent are called convergent. A case where traits are similar, but are derived from different, closely related ancestors, is referred to as a parallelism. Convergence and parallelism together are referred to as homoplasy.
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2/1/2008 2 How to Construct Phylogenies Phenetics – Based on overall similarity. Sometimes called numerical taxonomy. Cl di ti Cladistics – Based on evolution of characters. Developed first by Willi Hennig and later expanded by E. O. Wilson.
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b112_Lecture_25 - 2/1/2008 Taxonomy:MakingSenseofAllthe...

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