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Life evolves! What is life? What is evolution? Evidence for evolution Testing evolutionary hypotheses.

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Presentation on theme: "Life evolves! What is life? What is evolution? Evidence for evolution Testing evolutionary hypotheses."— Presentation transcript:

1 Life evolves! What is life? What is evolution? Evidence for evolution Testing evolutionary hypotheses

2 What is Life? Discuss with your neighbors and write a consensus definition of LIFE. Log on to Learning Catalytics Session ID: Map your seat

3 Early Evidence for Biological Evolution 1.Homology 2.Fossil record 3.Geological evidence

4 Homology homologous structure of mammal limbs suggest descent from a common ancestor (Buffon, ) See also Fig

5 Homology vs analogy University of California Museum of Paleontology (http://evolution.berkeley.edu)

6 Testing predictions from evolutionary theory: are tetrapod limbs homologous? University of California Museum of Paleontology (http://evolution.berkeley.edu)

7 Fossil ancestral tetrapods have same limb structure University of California Museum of Paleontology (http://evolution.berkeley.edu)

8 Meet Ichthyostega 363 Mya

9 And lobe-finned fish have similar bone structure 390 mya University of California Museum of Paleontology (http://evolution.berkeley.edu)

10 Oh no! The fossil record has a gap! Tiktaalik.uchicago.edu

11 Where can we find exposed rocks of the right age and type? Tiktaalik.uchicago.edu

12 Tiktaalik, a transitional fossil predicted by evolutionary theory Tiktaalik.uchicago.edu


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