Bio 201 F08 True lect 7v4r

Bio 201 F08 True lect 7v4r - Make sure you understand how...

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Unformatted text preview: Make sure you understand how this works Reading phylogenetic trees Reading phylogenetic trees MONOPHYLETIC GROUP - contains a common ancestor and all of its descendants PARAPHYLETIC GROUP - contains an ancestor and only some, not all of its descendants POLYPHYLETIC GROUP - does not contain the common ancestor Bryophytes Ferns Fungi Insecta Amphibia Aves Mammalia Is this a monophyletic group? Which (if any) of these trees are identical? Amphibia Aves Mammalia A B Amphibia Aves Mammalia C Amphibia Aves Mammalia D Amphibia Aves Mammalia Using phylogenetic trees The Evolutionary History of HIV • How fossils are dated • History of Life on Earth: beginnings • Chemical Evolution (pre-biotic) • Origin of Life • Biological Evolution • Evolution of Ecosystems Origin and Evolution of Life on Earth Most evidence of this history of life comes from the fossil record Fossil cicada from the lower Cretaceous (~130-145 mya) How do we date fossil evidence? • Relative: fossils occur in sedimentary rocks – Older rocks occur below younger rocks • Geologic formations of various ages are recognized, and often named, by the fossils they contain – Can use this to match geologic layers from different parts of the world • Absolute: – Radioisotope dating • E.g. carbon for fossils < 50,000 years old • 14 C/ 12 C ratio in all living organisms is roughly constant...
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This note was uploaded on 04/14/2009 for the course BIO 201 taught by Professor True during the Fall '08 term at SUNY Stony Brook.

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Bio 201 F08 True lect 7v4r - Make sure you understand how...

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