7.Basics of Evolution.pt1

7.Basics of Evolution.pt1 - Contemporary Evolutionary...

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Contemporary Evolutionary Theory: 1. Darwin’s Natural Selection – explains loss of traits & changes in trait frequencies over time. 2. Mendel’s Principles of Inheritance – explains how traits pass to future generations. 3. Genetic Mutation – explains how new traits originate.
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3 Conditions for Natural Selection Variation : each species is comprised of a variety of individuals with a range of traits Heritability : these traits are passed on to offspring through sexual reproduction Differential reproductive success : Individuals expressing traits that are well suited to exploit a particular environment reproduce at a higher frequency than others unable to inhabit that productive environmental relationship - niche
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Adaptation An expressed trait (biological or behavioral) that enables higher frequencies of reproductive success in a particular environmental context
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“Survival of the Fittest” (Herbert Spencer) Misused natural selection as an excuse for social inequality. A hypothesis which is seen today as a denial of history and an attempt to rationalize inequality. “Social Darwinism”
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Darwinian Fitness Who is more evolutionarily fit? Cletus Homer
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Natural Selection couldn’t account for two things: (1) Inheritance of traits. [answer: Mendelian Inheritance] (2) How new traits came about. [answer: Genetic Mutation]
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Father Gregor Mendel Principles of Inheritance (1866) 1.
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