BIO CH 23

BIO CH 23 - 1 Systematics and the Phylogenetic Revolution...

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Unformatted text preview: 1 Systematics and the Phylogenetic Revolution Chapter 23 After studying them...We have to apply the principle of parsimony. Which two of these three animals are more closely related? Can you tell just by looking? Convergent Evolution Earth is about 4.6byo In general, it is assumed that the higher the proportion of characteristics that two organisms share, the more recently they diverged from a common ancestor. 6 Fossil Records and radioactive data are related to evolutionary trees of existing species to give a historical perspective. 8 Phylogenies depict evolutionary relationships Do All of These Trees Say the Same Thing? 9 • Oscillating selection: Traits can evolve in one direction, then back the other way • Evolution is not always Divergent: convergent evolution – Use similar habitats – Similar environmental pressures • Evolutionary reversal: process in which a species re-evolves the characteristics of an ancestral species...no tail in mammalian man (tailed reptile ancestor) no tail in amphibian frog, Ebb and Flow of Evolution 10...
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This note was uploaded on 11/23/2010 for the course BSC Bsc 1000 taught by Professor Garcia during the Fall '10 term at FIU.

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BIO CH 23 - 1 Systematics and the Phylogenetic Revolution...

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