Evidence_for_Evolution

Evidence_for_Evolution - Evidence for Evolution 1...

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Evidence for Evolution 1
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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 2
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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 3
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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 4
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Is Biological Change Possible?: The Domestication of Animals 5
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The Domestication of Dogs: Dogs are Descendents of Wolves Phylogenetic analyses unambiguously show that all domestic dogs are descended from wolves ( Canis lupus ) The initial reasons for why, and how dogs were domesticated is a source of ongoing fascination Grey Wolf ( Canis lupus ) 6
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Selective Breeding: 6000 years 7
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Silver 8
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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) 9
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Evidence for Descent with Modification, Direct Observation of Change: Soapberry Bugs Text pages 40 and 41 10
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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 11
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Example: House sparrow 12
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Evidence for Descent with Modification: Vestigial Structures and Organs Human Coccyx: Tailbone Apteryx mantelli 13
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Evidence for Descent with Modification: Vestigial Structures and Organs Rubber Boa: Vestigial Limbs Human Arrector pili 14
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Evidence for Descent with Modification: Fossil Record Extinction: E.g. Irish elk and Trilobites 15
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Evidence for Descent with Modification (cont.) The Law of Succession
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Evidence_for_Evolution - Evidence for Evolution 1...

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