lecture 3 phylogenetics and macroevolution

lecture 3 phylogenetics and macroevolution - Tree Thinking...

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Unformatted text preview: Tree- Thinking: Using phylogenies to understand macroevolution • Dr. Luke J. Harmon, Univ. of Idaho • Readings: Chapter 13: 211-216 ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● Macroevolution • Macroevolution is evolution at or above the level of species • How do new species form and change? How Can We Learn About Macroevolution? • Fossils • Compare fossils from different time periods, describe their relationships • But we don’t always have fossils... Trilobite Evolutionary Trees ancestral stock species 1 species 2 species 3 Summarize information about relationships among groups Phylogenetic Tree • A tree showing the evolutionary relationships among species • Shows the branching pattern of ancestors and descendants that are united by common descent Phylogenetic Tree Human Chimp Gorilla Phylogenetic Tree Human Chimp Gorilla tips Phylogenetic Tree Human Chimp Gorilla branch Phylogenetic Tree Human Chimp Gorilla branch Represents an evolutionary lineage Phylogenetic Tree Human Chimp Gorilla node Phylogenetic Tree Human Chimp Gorilla node Represents the most recent common ancestor (MRCA) of a set of species Phylogenetic Tree Human Chimp Gorilla clade Phylogenetic Tree Human Chimp Gorilla clade A set of species descended from a common ancestor How to Build a Tree...
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This note was uploaded on 04/07/2008 for the course BIOL 102 taught by Professor Storfer during the Spring '08 term at Washington State University .

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lecture 3 phylogenetics and macroevolution - Tree Thinking...

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