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C. Common Ancestry predicts transitional fossils

C. Common Ancestry predicts transitional fossils. The late Devonian—no vertebrates on land yet. http:// web.ebscohost.com/ehost/external?hid =104&sid=2bc49599-c99c-47ef-83ac-108354959315%40sessionmgr113&vid=7. True tetrapod. True fish. D. LUCA.

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C. Common Ancestry predicts transitional fossils

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  1. C. Common Ancestry predicts transitional fossils

  2. The late Devonian—no vertebrates on land yet

  3. http://web.ebscohost.com/ehost/external?hid=104&sid=2bc49599-c99c-47ef-83ac-108354959315%40sessionmgr113&vid=7http://web.ebscohost.com/ehost/external?hid=104&sid=2bc49599-c99c-47ef-83ac-108354959315%40sessionmgr113&vid=7

  4. True tetrapod True fish

  5. D. LUCA All living things have much in common, in their chemical composition, their germinal vesicles, their cellular structure, and their laws of growth and reproduction… Therefore I should infer… that probably all the organic beings which have ever lived on this earth have descended from some one primordial form, into which life was first breathed (Darwin, 1859, pg. 484, “On the Origin of Species”)

  6. Morphology?? LUCA 1970’s-Discovery of the “Archaebacteria” (extremophiles) 1990’s-Discovered they were distantly related to “Bacteria” Renamed them the Archaea

  7. The tree of life began to look like this  in 1977: 1 gene (ribosomal) LUCA Carl Woese

  8. Modern Genetics (late 1990’s and 2000’s): Many genes

  9. Web of life Maybe “LUCA” wasn’t a single species, but a community of species that shared genes The “Web” of Life

  10. Carl Woese-discoverer of the Archaea

  11. A modern view of the TOL or WOL must include Lateral Gene Transfer (LGH) What are these?

  12. “The solar-powered sea slug” carries genes for photosynthesis in its nuclear genome; these genes operate with the chloroplasts that it steals

  13. “There is a natural impulse for evolutionists to circle their wagons in making common cause against the creationists. I think we should resist it. Evolutionary theory itself evolves, but creationists attack it as a dogma of a revealed religion of which Darwin was the prophet, celebrating debate within the field as evidence for doctrinal weakness. In fact, it is evidence for disciplinary strength…” • “I will argue that many of us have been defending a too- narrow form of neo-Darwinism, and that accepting a more pluralistic view of evolutionary pattern as well as evolutionary process will put us in a better position…” • … a TOL might be the right idea within the three big lineages, but the WOL might be a better concept for early life From Doolittle, Phil. Trans. R. Soc. B (2009) 364, 2221–2228

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