Evidence for Evolution

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Evidence for Evolution

Evidence of Evolution (Don’t panic about the length! Out of the 27 slides, only 9 have written info on them. There’s just a lot of pictures.)

Evidence for Evolution

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Evidence for Evolution

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Presentation transcript:

Evidence for Evolution

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

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

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

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

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

Fossil Evidence of Evolution Whale “missing links”

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

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

copyright cmassengale Homologous Structures copyright cmassengale

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

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

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

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

Similarities in DNA Sequence copyright cmassengale

Evolution of pesticide resistance in response to selection copyright cmassengale

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

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