11EvolutionF10b - BIOL 110 Evolution Evolution overview...

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Unformatted text preview: BIOL 110 Evolution Evolution overview Evolution: What is it? What is the evidence for evolution? What things drive evolution? Do these things interact and if so, how? What is the result of evolution? The theory of evolution Evolution is just a theory That puts it on the same level as Atomic structure Rutherford/Bohr model Quantum mechanics The attraction of large bodies in space Gravitation Theory of general relativity Chemistry and physics are governed by natural laws, why not biological change? Confusion of evolution There has been a confusion of ideas We have ideas, some data, but no solid conclusions Evolution/religion The supposed conflict between religion and evolution Religion is faith-based, evolution is based on physical evidence Evolutions history Charles Darwin is most closely identified with evolution Darwins contribution: define a biologically realistic mechanism that drives evolution More on that later Evolution defined Evolution , simply defined: Evolutionary change is population-based Individual change is called growth and development What changes: Size, shape, colors, mating calls, habitat use, allele frequencies, physiology and many more What evidence is there of evolution? Evidence of evolution Evidence of change in biological systems comes from three sources: 1. Selective breeding (artificial selection) 2. Observation/experimentation 3. The fossil record Selective breeding Selective breeding : The favorable traits are determined by the breeder, not nature The next generation of animals or plants display the desired characteristics Artificial selection : changes brought about in domesticated animals and plants through selective breeding Artificial selection in corn Artificial selection on corn oil production Results of artificial selection Artificial selection results from the large differences in the numbers of offspring left by individuals Can result in dramatic changes over time Observing evolution in nature Peppered moth comes in two varieties Become more common in industrial areas Frequency of light color moths decreases because of selection from predation The fossil record History of the planet is recorded in the rocks Planet is ~ 4.6 billion years old Fossil cells appear ~ 3.5 billion years ago Conclusion: the species composition of the Fossil ages & complexities Stratification : More complex forms clearly related to simpler forms (transitions from simple to complex) Expected If all life is descended from the same original event and diversified Transitional forms: Tiktaalik Transitional forms : Tetrapod evolutionfrom water to land Neck and limb evolution important Predicted where transitional forms would be foundintermediate aged rocks Found a link in evolution: Tiktaalik Transitional Forms in Tetrapod Evolution: Tiktaalik Gills/scales like a fish Neck like amphibian Figure 35.14 Tiktaalik limb evolution: transitioning from water to land What drives evolution?What drives evolution?...
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This note was uploaded on 02/07/2011 for the course BIO 111 taught by Professor Dr. bos during the Fall '10 term at Purdue University-West Lafayette.

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11EvolutionF10b - BIOL 110 Evolution Evolution overview...

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