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U of M ANTH 1001 - Lecture 8 9-28-17 Speciation (19 pages)

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Lecture 8 9-28-17 Speciation



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Lecture 8 9-28-17 Speciation

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Pages:
19
School:
University of Minnesota- Twin Cities
Course:
Anth 1001 - Human Evolution
Human Evolution Documents

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9 28 2017 1 Bake Sale Anthropology Club Bake Sale Today from 10am 2pm Willey Hall right outside this very classroom Any questions about Anthro Club can be answered at the bake sale table Proceeds fund the Undergraduate Anthropology Club Annual Conference 2 1 9 28 2017 Darwin s 5 theories regarding evolution 1 Species change evolution as such 2 All organisms share a common ancestry 3 Evolution is gradual 4 Evolution leads to speciation 5 Evolution occurs through Natural Selection 3 Convergent Evolution 2 9 28 2017 Speciation bridging micro and macro evolution Micro evolutionary processes four forces patterns of Macro evolution speciation common ancestry above the species level A common comment on the street Forming new species is impossible because the first reproductively isolated organism will be incapable of mating with any other organism 5 Speciation bridging micro and macro evolution This reasonable but unfounded misconception is based in the idea that speciation is an EVENT rather than a PROCESS getting there is half the fun Indeed perhaps the very best evidence supporting evolution is the process of speciation 3 9 28 2017 Scale of Macroevolution Age of life on Earth 3 500 000 000 years Washington Ave Bridge 1 500 feet Each foot 26 million years Each inch 200 000 years the age of our species H sapiens Thickness of your hair 0 004 inches or 777 years Plenty of time for speciation given documented microevolution 7 Liger cross from a male lion and female tiger Species Life can be clustered into distinct types Species are real biological concepts Species are difficult to define Liger couple by Hkandy Own work Licensed under CC BY SA 3 0 via Commons https commons wikimedia org wiki File Liger couple jpg media File Liger couple jpg Mule cross from a male donkey jack ass and female horse mare Hybrid vigor but still sterile 8 4 9 28 2017 Speciation as gene flow complete hybridization same species how do you get from complete hybridization to NO hybridization no


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