Presentation 3 Evolution II Sp08 BB

Presentation 3 Evolution II Sp08 BB - `Nothing in biology...

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‘Nothing in biology makes sense except in the light of evolution’ Theodius Dobhansky, American Geneticist Today’s Topics •What is a species? *What evidence is there that evolution occurred? *How do new species form? *Case study of evolution – Darwin’s finches *What about humans? What is a species? •Idea of species is central to a discussion of evolution What evidence is there that evolution occurred? •A lot of indirect evidence –Things that we would expect to see if indeed species can change and evolve due to the proposed theory What evidence is there that evolution occurred? •Animal and plant breeding *Fossils *Comparative anatomy *Biochemistry (the chemistry of cells) Animal and plant breeding •Farmers had worked to improve domesticated animals and plants by breeding individuals with the most desirable traits –Conclude that characteristics of a species could change *Could also happen in nature where the environment is the selection force Fossils •Layers of different fossils in rocks indicate that species in
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This note was uploaded on 04/16/2008 for the course BIO 200 taught by Professor ? during the Spring '08 term at CSU Long Beach.

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Presentation 3 Evolution II Sp08 BB - `Nothing in biology...

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