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Chapter 12 Lecture Notes Fall 2007

Chapter 12 Lecture Notes Fall 2007 - Current Species...

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1 Vertebrates Crustaceans Insects Mollusks Roundworms Plants Fungi Protozoans 0 400 800 1,200 1,600 Number of species (x 1,000) over 4 million Current Species Diversity Fig. 29.26 est. 5 million - 30 million different species (~1.5 million species identified) Evolution cells, molecules, energy transformations, DNA, genetic mechanisms Evolution Genetic change over time in a population or species, not an individual Selective Breeding dog breeds
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2 Different Species/Strains from one Requires genetic variation in original population wild mustard cauliflower cabbage brussels sprouts broccoli kale kohlrabi Fig. 24.11 Variation in Phenotypes (traits) Fig. 12.8 Galápagos tomato plant, Lycopersicon Cheesmanii Fig. 12.6 Adaptations heritable (genetic)
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3 Variation in Genotypes… Gene Pool = all alleles in population Mutation only source new alleles VALINE HISTIDINE LEUCINE PROLINE THREONINE GLUTAMATE VALINE original base triplet in a DNA strand As DNA is replicated, proofreading enzymes detect the mistake and make a substitution for it: a base substitution within the triplet (red) One DNA molecule carries the original, unmutated sequence The other DNA molecule carries
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