ES chapter 5 Evolution with pictures

ES chapter 5 Evolution with pictures - Chapter 5:...

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Chapter 5: Evolution, Biodiversity & Population Ecology www.aw-bc.com/Withgott
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Evolution genetic change in populations of organisms across generations. modifications appearance appearance: www.aw-bc.com/Withgott
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Evolution functioning functioning: beaks in honeycreepers www.aw-bc.com/Withgott
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Natural Selection explains the great variety of living organisms. derives from several premises noticed in nature
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Natural Selection Premises constant struggle of organisms to survive and mate organisms tend to produce more offspring that can survive. individuals of the same species are not identical variation
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Variation genetical differences environment within which genes are expressed interaction between genes and environment Adaptation Adaptation : : trait that promotes success of a species
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Effects of Natural Selection on Genetic Variation Mutations Mutations : : accidental changes in the nucleotide sequence of the DNA addition deletion substitution
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Sexual Reproduction also Generates Variation recombination of genes produces a novel combination generating variation directional selection stabilizing selection disruptive selection
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Directional selection Directional selection selection that drives a feature in one direction www.aw-bc.com/Withgott
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Stabilizing selection Stabilizing selection preserves status quo, no changes www.aw-bc.com/Withgott
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Disruptive Selection traits diverge into two or more directions www.aw-bc.com/Withgott
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Evidence of Natural Selection Selective breeding Selective breeding breeding of domesticated animals and plants dog and cat breeds variations of Brassica oleracea artificial selection
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Total of all organisms in the area
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ES chapter 5 Evolution with pictures - Chapter 5:...

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