BI 215 Ch2 - CH. 2: The tree of life Classification and...

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Unformatted text preview: CH. 2: The tree of life Classification and Phylogeny What is the history of life? Phylogenetics: study of the genealogical history of organisms Relationship to a common ancestor Relationship between organisms When various characteristics evolved Didnt observe evolutionary history Must infer using deductive logic Figure 2.1 The Tree of Life Figure 2.1 The Tree of Life (Part 3) Figure 2.1 The Tree of Life (Part 2) Figure 2.1 The Tree of Life (Part 1) Described Species = 2.1x 106 Estimated Actual Species = 3.5-30x106 Fraction of total ever = <1% CLASSIFICATION AND PHYLOGENY All Organisms Animals Systematics Systematics = phylogenetic analysis + taxonomy Linneaus established the binomial system of classification TAXON* Kingdom Phylum Class Order Family Genus Species STEGOSAURUS Animalia Chordata Archosauria Ornithischia Stegosauridae Stegosaurus stenops HUMAN Animalia Chordata Mammalia Primates Hominidae Homo sapiens Systematics Systematics = phylogenetic analysis + taxonomy Linneaus established the binomial system of classification Post-Darwin, classification had a relationship with history Human Phylogeny Reading phylogenies Usually, only can know the tips of the branches Infer ancestors Speciation Ancestors...
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BI 215 Ch2 - CH. 2: The tree of life Classification and...

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