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Phylogenies and Tree-Thinking PowerPoint PPT Presentation


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Phylogenies and Tree-Thinking. by David Baum & Susan Offner The American Biology Teacher April, 2008 PowerPoint presentation compiled by Larry Flammer, ENSI webmaster

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Phylogenies and Tree-Thinking

by David Baum & Susan Offner

The American Biology Teacher

April, 2008

PowerPoint presentation compiled by Larry Flammer, ENSI webmaster

From Phylogenies & Tree-Thinking. David A. Baum and Susan Offner. The American Biology Teacher, 70(4), 222-229. With the kind permission from the National Association of Biology Teachers and David Baum.


Figure 1Hypothetical genealogy of local population of plants


Fig. 2. How genealogy of sexual population is included in a phylogenetic tree


Fig. 3. Tree diagram is meant to represent an actual history of evolutionary lineages that have branched over time


Fig. 4. Four trees, all depict same evolutionary history


Fig. 5. Some important terms used to describe phylogenetic trees


Fig. 6. How to read a tree in terms of evolutionary relationships


Fig. 7. Three trees, all depict the same evolutionary history


Fig. 8. A clade includes all and only the descendants of a paticular ancestor


Fig. 9. How trees show evolutionary history


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