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CHARLES DARWIN proposed natural selection to explain evolution published On the Origin of Species in 1859

CHARLES DARWIN proposed natural selection to explain evolution published On the Origin of Species in 1859. 13.1. VARIATION within a population. A varied population is a POLYMORPHIC population. Not here. Yes! . Why are the jaguars varied, but not the bacteria? .

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CHARLES DARWIN proposed natural selection to explain evolution published On the Origin of Species in 1859

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  1. CHARLES DARWIN proposed natural selection to explain evolution published On the Origin of Species in 1859 13.1

  2. VARIATION within a population

  3. A varied population is a POLYMORPHIC population Not here Yes! Why are the jaguars varied, but not the bacteria?

  4. BELL CURVE shows the frequency of a variation in a population

  5. • Genetic variation reflects mutations in the DNA Variation is visible & measureable Observe & measure phenotypic variation

  6. Observe and measure variation at the gene level Heterozygotes express some sickling, but have malaria resistance

  7. Observe & measure variation at the nucleotide level via genome sequencing

  8. OVER-REPRODUCTION creates competition toad tadpoles spiders fish roe

  9. ENVIRONMENTAL CHANGE creates competition

  10. VARIATIONS may have differential success

  11. REPRODUCTIVE SUCCESS for the ‘most fit’ causes microevolution

  12. Methicillin-resistant Staphylococcus aureus, (MRSA) is bacterium that can infect open wounds, blisters and skin lesions. Resistant to most of the drugs traditionally used to fight the bacteria, Antibiotic Resistance

  13. FITNESS? Fit = most offspring Not literally ‘fit’

  14. Quantify microevolution via changes in frequency (allelic, phenotypic, etc) P F1 F2 F3 F4 F5 1.0 0.33/0.33/0.33 0.5/0.5 0.5/0.25/0.25 0.5/0.5 0.4/0.6

  15. Microevolution can lead to macroevolution in time Speciation results One ancestor, many descendants Adaptive radiation The adaptive radiation of the Galpagos finches

  16. Geology PesticideResistance Geomorphology ComparativeBiochemistryDNAComparativeEmbryology ComparativeAnatomy FossilRecordChapters 21/22 Protein Geography AntibioticResistance Geology ProteinEVIDENCEGeomorphology ComparativeBiochemistryDNAComparativeEmbryology ComparativeAnatomy SelectiveBreeding GeographyFossilRecord AntibioticResistance Protein Geology

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