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Chapter 27 PHYLOGENIES AND THE HISTORY OF LIFE

Summary. Tools for studying the history of lifeDataKey changes how they occurAdaptive radiations and mass extinctions. Tools for Studying the History of Life. Phylogenies: evolutionary histories of groups (taxa) of organisms usually depicted as trees. Note, phylogenies are hypotheses.Fossils

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Chapter 27 PHYLOGENIES AND THE HISTORY OF LIFE

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    1. Chapter 27 PHYLOGENIES AND THE HISTORY OF LIFE Themes and Patterns over the last 4.6 billion years.

    2. Summary Tools for studying the history of life Data Key changes – how they occur Adaptive radiations and mass extinctions

    3. Tools for Studying the History of Life Phylogenies: evolutionary histories of groups (taxa) of organisms usually depicted as trees. Note, phylogenies are hypotheses. Fossils – collection continues to grow, transitional forms are found and relationships are refined.

    4. Phylogenies as Trees “Estimates” or hypotheses of the relationships among organisms. Reading the tree: Root Branches Nodes (forks) Branch Tips Outgroup –

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