Friday’s in the Lab: Bones and Phylogeny
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Start with Organizing/classifying organisms.
o Why did you organize them the way you did?
o See Paul’s: http://serendip.brynmawr.edu/reflections/evolution/diversitygame.html
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Run EvoBeacker Simulation. Discuss events. Then pose question…how do we know
these relationships when no one was there to watch them…cannot be there because it
takes too many lifetimes?
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Genealogies: who are you most closely related to? Brother/sister, then parents then…?
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Relationship btwn species: Vertebrates? Look at vertebrates and tell me which ones
share a common ancestor most recently…or in other words, which two are the most
closely related.
o Why? On what did you base your conclusion?
o Thus, similarity equals common ancestors. Why? b/c decent w/
modification…you inherit your dna from your parents
o Same with organisms. They look alike b/c they inherited dna from common
ancestors, from parent species.
o Geneology vs Phlogeny trees: http://evolution.berkeley.edu/evolibrary/article/0_0_0/similarity_hs_04
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So how do scientists represent evolutionary relationships?
o Trees: vertebrate tree: http://evolution.berkeley.edu/evolibrary/article/0_0_0/evo_03
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Homology versus Similarity due to Convergence
o Homology = similarity due to common ancestry
 Homology home: http://evolution.berkeley.edu/evolibrary/article/0_0_0/similarity_hs_01
o Convergent Similarities: http://evolution.berkeley.edu/evolibrary/article/0_0_0/similarity_hs_08
 Other examples: fins, wings, others?
o 3 criteria: http://evolution.berkeley.edu/evolibrary/article/0_0_0/similarity_hs_10
 Devo Bio (haeckel): http://en.wikipedia.org/wiki/Image:Haeckel_drawings.jpg
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Students complete Homology Worksheet - bone activities
LUNCH
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Students finish Homology Worksheet - bone activities
Demo Protein visualization:
o Procedure for using Visualizing Protein Structure: Go to Entrez Protein (http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=Protein) “per2 NP_073728”.
Amino Acid Phylogenetic Worksheet and Fish Gel review
Finish with web search of more fish info to first evolutionary fish tree.