Lec 12 - BIS2B Fall 2009 (Keen) Lecture 12. Natural...

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BIS2B Fall 2009 (Keen) Lecture 12 . Natural selection examples 14 October Recap of the main points of natural selection an example of natural selection on plants (Hawksbeard) in natural and urban habitats practice seeing the action of natural selection Students should be able to: explain why Alfred Russel Wallace is discussed with Darwin explain the three essential conditions for natural selection define an agent of selection explain how generation time affects the response to selection predict how natural selection will operate for a particular set of given conditions
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“If you accept that natural traits are variable, that variation is heritable and that there is a struggle for existence, evolution by natural selection must follow.” - Charles Darwin
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The crisis of 1857 The crisis of 1857 -58: Alfred 58: Alfred Russel Russel Wallace Wallace Alfred Russel Wallace (1823-1913); photo taken when he was 25 C. DARWIN to A.R. WALLACE Down, Bromley, Kent, May 1, 1857. My dear Sir,—I am much obliged for your letter of Oct. 10th from Celebes, received a few days ago: in a laborious undertaking, sympathy is a valuable and real encouragement. By your letter, and even still more by your paper in the Annals,28 a year or more ago, I can plainly see that we have thought much alike and to a certain extent have come to similar conclusions . In regard to the paper in the Annals, I agree to the truth of almost every word of your paper; and I daresay that you will agree with me that it is very rare to find oneself agreeing pretty closely with any theoretical paper; for it is lamentable how each man draws his own different conclusions from the very same fact. This summer will make the twentieth year (!) since I opened my first note- book on the question how and in what way do species and varieties differ from each other. I am now preparing my work for publication , but I find the subject so very large, that though I have written many chapters, I do not suppose I shall go to press for two years.
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A BOOK THAT CHANGED THE WORLD: A BOOK THAT CHANGED THE WORLD: “The Origin of Species by Means of Natural Selection The Origin of Species by Means of Natural Selection or the or the Preservation of Preservation of Favoured Favoured Races in the Struggle for Existence Races in the Struggle for Existence 1859
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Conditions for natural selection • Individuals vary with respect to phenotype
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This note was uploaded on 04/21/2010 for the course BIS 2C BIS 2C taught by Professor Rizzo during the Winter '09 term at UC Davis.

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Lec 12 - BIS2B Fall 2009 (Keen) Lecture 12. Natural...

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