[3] Evidence For Evolution

[3] Evidence For Evolution - Evidence for Evolution...

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Evidence for Evolution
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Objectives To review the evidence for evolution Homology/ Analogy Phylogeny and change through time Fossil record Geologic time scale and dating Reading: Chapter 2, Pay particular attention to Box 2.3
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Some Basic Definitions Evolution : descent with modification Homology : similarity due to common ancestry (the same origin), often despite differences in function Analogy : Similarity in function, but not having the same origin
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The History of Life The possibilities: Special Creation Evolution According to scientific evidence, how did species arise on earth? We will consider the evidence for: Descent with modification and common ancestry
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Is Biological Change Possible?: The Domestication of Animals
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The Domestication of Dogs: Dogs are Descendents of Wolves Phylogenetic analyses unambiguously show that all dogs are descended from wolves ( Canis lupus ) The initial reasons for why, and how dogs were domesticated is a source of ongoing fascination Gray Wolf ( Canis lupus )
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Selective Breeding: 6000 years
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Do other species change over time? Scientific evidence supports two modes of evolution: Microevolution: small evolutionary changes within species or populations Macroevolution: referring to larger phenotypic changes sufficient to place an organism in a different genus or higher level taxon (eg phylum)
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Evidence for Descent with Modification, Direct Observation of Change: Soapberry Bugs Text pages 40 and 41
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Direct Observation: House Sparrows Introduced into North America from Europe in 1852 Rapidly Spread Across North America Populations have evolved differences in body size and coloration since that time
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Example: House sparrow
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Evidence for Descent with Modification: Vestigial Structures and Organs Human Coccyx: Tailbone Apteryx mantelli
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Evidence for Descent with Modification: Vestigial Structures and Organs Rubber Boa: Vestigial Limbs Human Arrector pili
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Evidence for Descent with Modification: Fossil Record Extinction: E.g. Irish elk and Trilobites
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Evidence for Descent with Modification (cont.) The Law of Succession
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This note was uploaded on 12/23/2010 for the course BIOL 359 taught by Professor Johnnathwitt during the Winter '09 term at Waterloo.

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[3] Evidence For Evolution - Evidence for Evolution...

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