Lecture2_EvidenceForEvolution - Zealand 2 Homology(“same...

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The Evidence for Evolution I. “The mystery of mysteries” Science starts with a question Where do species come from, and how have they come to be so well adapted to their environments? Back to our example: Nemoria arizonaria II. The theory of special creation Theory = a proposed explanation for a general phenomenon or class of phenomena Many scientific theories have two components: • Pattern = a claim about • Process = a mechanism that Process component of the theory of special creation: instantaneous origin of all species by a supernatural Creator Pattern component of the theory of special creation: • species are • species were created • species are Testing the theory: A. Are species recent? 1. Uniformitarianism 2. Radiometric dating • Earth is ~ first evidence of life ~ B. Were species created independently? Are they unrelated? 1. Geographic relationships: • Galapagos islands have different, but extremely similar mockingbirds and tortoises
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• Similar species of birds (ratites) on Madagascar, South America, Africa, Australia, and New
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Unformatted text preview: Zealand 2. Homology (“same source”) = similarities in form among species • genetic: genes with similar function are similar in • developmental: • structural: 3. Genetic code is (nearly) universal C. Are species static? Do they change through time? 1. The law of succession: fossil forms found in an area are similar to 2. The fact of extinction: 3. Vestigial traits: 4. Evolution in action: III. Lamarckian evolution (later, Erasmus Darwin) Pattern component was based on the Great Chain of Being (from Aristotle’s Scale of Nature) • forms evolved (changed) over time: • start with spontaneous generation of bacteria and simple cells Key characteristic of Lamarck’s theory (pattern component): Process responsible for change through time: inheritance of acquired characters Key characteristic of Lamarck’s theory (process component):...
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Lecture2_EvidenceForEvolution - Zealand 2 Homology(“same...

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