Lecture 13 - 3/3/2011 1 Evolution, Natural Selection March...

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Unformatted text preview: 3/3/2011 1 Evolution, Natural Selection March 3, 2011 ENV200H1S 1 Announcements Tutorial # 3 posted and will run next week Midterms marks will be posted by Mon Mar 7 th , and returned next week in tutorial Final Exam: Tuesday April 26, 2 5pm A Sc: EX200 Se Z: EX100 Environment Career Day TODAY!! HART HOUSE, GREAT HALL THUR, MARCH 3 rd , 10 3 http://careerday.environment.utoronto.ca/ 2 Outline Evolution Natural selection: mechanism of evolution The role of genetic The role of genetics Sexual Selection Genetic drift Founder effect 3 In the early days of life on Earth In the early days of life on Earth Resources would have been abundant Resources would have been abundant Populations would have grown rapidly Populations would have grown rapidly But as populations began to approach carrying But as populations began to approach carrying capacity, competition for resources would have capacity, competition for resources would have capacity, competition for resources would have capacity, competition for resources would have increased increased Any heritable adaptation or element that could Any heritable adaptation or element that could confer an advantage with respect to obtaining/using confer an advantage with respect to obtaining/using resources would have been selected for (adaptive) resources would have been selected for (adaptive) 4 Charles Darwin and Alfred Wallace were both influenced by Charles Darwin and Alfred Wallace were both influenced by Malthus (human population growth will outstrip resources Malthus (human population growth will outstrip resources leading to death and social upheaval) leading to death and social upheaval) They both also recognized that: They both also recognized that: Overproduction: organisms produce more offspring than can survive Overproduction: organisms produce more offspring than can survive Variation: individuals in a population exhibit variation...
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This note was uploaded on 08/10/2011 for the course ENV 200 taught by Professor Karening during the Spring '11 term at University of Toronto- Toronto.

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Lecture 13 - 3/3/2011 1 Evolution, Natural Selection March...

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