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Ch.26 - Ch.26 Monday 1:36 PM Lecture Topic 1 Phylogeny a...

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Ch.26 Monday, February 02, 2009 1:36 PM Lecture Topic: 1. Phylogeny a. The evolutionary history of a species or group of related species 2. Systematic a. Analytical approach to understanding the diversity and relationships of organisms i. Morphological, biochemical, and molecular comparisons used to infer relationships 3. Concept 26.2: Phylogenies are inferred from morphological and molecular data 4. Morphological & Molecular Homologies a. Phylogenetic history can be inferred from similarities in homologous structures and genes when compared among organisms b. Generally i. Similar morphology and similar DNA sequences = closely related species c.But, beware of analogous structures or molecular sequences (aka homoplasies) i. Similarity may be due to convergent evolution (analogy), not shared ancestry (homology) 5. Evaluating Molecular Homologies a. Fig. 25.6/7 b. Look at history of species DNA sequence in order to see if they were the same 6. Concept 26.3: Shared characters are used to construct phylogenetic trees 7. Cladistics a.
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