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Lecture3_handout_Aug2911

Lecture3_handout_Aug2911 - BioEE1780 Evolution and...

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BioEE1780 Fall 2011 Evolution and Biodiversity Today’s lecturer: Irby Lovette Lecture 3: August 29, 2011 1 The Darwinian Revolution, Then Till Now Origins of Evolutionary Theory Evidence for Evolution This lecture links to parts 1-3 of textbook chapter 2. It covers the scientific framework that we use to understand evolution and other features of the natural world, a brief history of the origins of evolutionary science, and some of the many lines of evidence that Darwin and later biologists have marshaled in support of evolutionary thinking. The Nature of Science Theory, Hypothesis, & Fact o In the technical language of science these terms have specific meaning which can differ from common usage o These terms have a special relationship to each other in the context of scientific knowledge and inference Definitions: o Theory §੿ Scientific usage: A coherent group of general propositions used as principles of explanation for a class of phenomena §੿ Common usage: A proposed explanation whose status is still considered conjectural o Hypothesis §੿ Scientific Usage: A tentative explanation for an observation, phenomenon, or scientific problem that can be tested by further investigation §੿ Common usage is the same. Note similarity to the common definition of theory. o Fact §੿ Scientific & common usage: Something that has actual existence: a matter of objective reality The nature of science o Facts are used to test hypotheses.
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