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Evidence for Evolution

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Presentation on theme: "Evidence for Evolution"— Presentation transcript:

1 Evidence for Evolution

2 copyright cmassengale
Evidence of Evolution Key Concept Darwin Argued That Living Things Have Been Evolving On Earth For Millions of Years. Evidence For This Process Could Be Found In: The Fossil Record The Geographical Distribution of Living Species Homologous Structures of Living Organisms Similarities In Early Development-Comparative Embryology Comparative Biochemistry Vestigial structures copyright cmassengale

3 Evolutionary Time Scales
Macroevolution: Long time scale events that create and destroy species. copyright cmassengale

4 Evolutionary Time Scales
Microevolution: Short time scale events (generation-to-generation) that change the genotypes and phenotypes of populations copyright cmassengale

5 copyright cmassengale
Fossil Record Earth is Billions of Years Old Fossils In Different Layers of Rock (sedimentary Rock Strata) Showed Evidence Of Gradual Change Over Time copyright cmassengale

6 Fossil Evidence of Evolution
records document the course of life through time

7 Fossil Evidence of Evolution
Whale “missing links”

8 Fossil Evidence of Evolution
Evolutionary change in body size and toe reduction of horses

9 copyright cmassengale
Comparative anatomy Homologous structures: Same Structure, different function Scientists Noticed Animals With Backbones (Vertebrates) Had Similar/Same Bone Structure May Differ In Form or Function Limb Bones Develop In Similar Patterns Arms, Wings, Legs, Flippers copyright cmassengale

10 copyright cmassengale
Homologous Structures copyright cmassengale

11 Vestigial structures of a whale
Comparative Anatomy Vestigial structures: have no apparent function, but resemble structures their ancestors possessed Examples: Appendix, ear muscles, coccyx, leg bone in snakes Vestigial structures of a whale


13 copyright cmassengale
Evidence for Evolution - Comparative Embryology Similarities In Embryonic Development copyright cmassengale

14 Comparative Embryology
Strongest anatomical evidence supporting evolution comes from comparisons of how organisms develop. Early vertebrate embryos possess pharyngeal pouches that develop into: In humans: glands and ducts In fish: gill slits

15 Similarities In Early Development
Embryonic Structures Of Different Species Show Significant Similarities Embryo – early stages of vertebrate development Help Scientist Group Animals copyright cmassengale

16 Similarities in DNA Sequence
copyright cmassengale

17 Evolution of pesticide resistance in response to selection
copyright cmassengale

18 copyright cmassengale
Evidence for Evolution – Evolution Observed Evolution of drug-resistance in HIV copyright cmassengale

19 Geographic Distribution of Living Species
Different Animals On Different Continents But Similar Adaptations To Shared Environments copyright cmassengale

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