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Bio 201 F08 True lect 7v4r

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

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Make sure you understand how this works
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Reading phylogenetic trees
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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
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Bryophytes Ferns Fungi Insecta Amphibia Aves Mammalia Is this a monophyletic group?
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Which (if any) of these trees are identical? Amphibia Aves Mammalia A B Amphibia Aves Mammalia C Amphibia Aves Mammalia D Amphibia Aves Mammalia
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Using phylogenetic trees The Evolutionary History of HIV
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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
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Most evidence of this history of life comes from the fossil record Fossil cicada from the lower Cretaceous (~130-145 mya)
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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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