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BIO 04 - 17 SEP - simple,butelegant September 17 Lecture 4...

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04/26/10   1 BIO152 Natural Selection  simple, but elegant September 17 Lecture 4
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04/26/10   2 Tutorial Friday natural selection versus artificial selection & acquired inheritance Online quiz (TUT site) 12 noon Thurs- 9am Friday Review lecture notes especially lectures 3&4 Review text readings (Ch1.2, 24.1, 24.2,, 24.3) Prepare the worksheet
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04/26/10   3 Lecture outline-  Introduction to the process of evolution Four components of natural selection Example-beak size (Freeman 24.3) Artificial selection (Freeman 1.2)
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04/26/10   4 Microevolution Microevolution —looks at how populations change over time [small scale changes in ‘small’, related group] May occur rapidly May be measured What is a population ?
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04/26/10   5 Natural selection 1. More individuals are born than survive and reproduce. 2. Individuals vary in characteristics which are heritable . 3. Certain heritable characteristics help individuals survive and reproduce better than other characteristics.
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04/26/10   6 Natural selection: 4 components 1. Variation -individuals in a population vary in traits 2. Inheritance -some variation is passed on to offspring 3. Survival -only some offspring live long enough to reproduce; some individuals produce more offspring 4. Survival is not random - some heritable traits offer an advantage
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04/26/10   7 More organisms are born than  survive
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04/26/10   8 Table 1 Population growth ideal versus  natural conditions Initial population Final population Time Ideal actual 2 elephants 750 yr 1.9 x10 6 130 2 house flies 5 mo 1.9 x10 20 890 1 E. coli 48 hr Cover earth 2m 1.5x10 6
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04/26/10   9 And more organisms survive than  reproduce What affects the outcome? The ecology: interaction of the individual in their environment (Padian’s article) Name some types of interactions:
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04/26/10   10 Natural selection  adaptive  evolution
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