Need title. EVOLUTION Tree Thinking Summer Institute 2014 UCR, Riverside Sofia, Blaire, Jinghua,...
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Transcript of Need title. EVOLUTION Tree Thinking Summer Institute 2014 UCR, Riverside Sofia, Blaire, Jinghua,...
![Page 1: Need title. EVOLUTION Tree Thinking Summer Institute 2014 UCR, Riverside Sofia, Blaire, Jinghua, Kelsey, Lauren, Brad, Beth, Kris “Education Evolves”](https://reader034.fdocuments.in/reader034/viewer/2022051315/56649efd5503460f94c10b5f/html5/thumbnails/1.jpg)
Need title
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EVOLUTIONTree Thinking
Summer Institute 2014 UCR, Riverside
Sofia, Blaire, Jinghua, Kelsey, Lauren, Brad, Beth, Kris“Education Evolves”
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Audience: Introductory Biology
• Prerequisite topics:– Scientific Method– Natural Selection – Descent with modification
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Learning Goal
• Students Should be Able to Use Phylogenetic
Trees to Understand Evolution
• Today’s Teachable Tidbit: Tree Thinking
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Learning OutcomesStudents should be able to:
• Apply the descriptive terminology associated with phylogenetic trees• Use shared derived characters to build phylogenetic trees • Understand difference between homology and convergence• Identify common ancestors• Interpret a given phylogenetic tree • Use the tree to make an evolutionary inference
Non-content learning outcomes:• Communicate science• Collaborate effectively• Think creatively
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Previous lesson: Anatomy of a Tree 1. Think-Pair-Share or homework assignment:Add the following terms to the blank tree:– Branch (Label only)– Node (Label and count)– Tip (Label and count)– Clade (Label and count)
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Character Mapping
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Character Mapping
In pairs:1. On your handout, write down each
morphological character on the tree at least once.
Report Out
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Evolution of Morphology
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Evolution of MorphologyIn groups for your assigned clade:• Identify the location on the phylogeny of the
most recent common ancestor• Then, from your stack of characters…– Find those that define your clade
• Of the remaining characters…– Find those that are features of the common ancestor
Class Consensus: Complete Summary chart
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Group Work Summary
• Shared Derived = characters that define your clade
• Shared Ancestral = other characters they share
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photos
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Put it all Together
• Convergence: a character that evolved independently multiple times in different branches
• Why do you think convergence is evidence for evolution by natural selection?
• Discussion and report back.
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Final Reflection
• One minute writing assignment: Can you think of other groups not shown here that also evolved wings for flight? How do you know that this is due to convergent evolution?
• Write your name on it. • Turn it in on your way out.