1One of Darwin’s fundamentalinsights regarding his proposedmechanism of evolution wasthat there must be geneticto act upon ina population of individuals.Fill in the blankDr. Sydney CameronSchool of Integrative BiologyDept. of Entomology215 [email protected] hours: T Th 11:00-12:00 or by appointment Midterm exam II changeFrom: Th 14 AprilTo: Tu 12 AprilEvolution: What is it?The natural process (es) bywhich populations andspecies change over time.“Descent with modification” (Darwin, Origin, 1859)Evolution: What is it?Descent with modification2Fossils: indicating extinctionIrish elkEvidence for Evolution?Living1.5 billionLivingLivingLiving850 MaFossil 950 MaCyanobacteriaJ. W. SchopfCradle of Life (1999)2.1 billionApex Chert Fossils of Western Australia3.5 billion yrs. Living organisms resemble the fossil formsfound in the same geographic regions but differfrom those in other regions Fossils: indicating extinctionFossils: Law of successionEvidence for EvolutionFossils fig. 2.6Successional FormspygmyarmadilloGlyptodontWombatDiprotodonFossils-- indicating extinctionFossils-- Law of successionFossils-- Transitional formsTransitional fossils have some traits found in earlyancestors and other traits found in the more recentdescendants. Evidence for Evolution3Microraptor gui(2003, China)Transitional formsContemporary whale (Bowhead)Basilosaurus isis (38 mya)Ambulocetus natans (50 mya)1 mTransitionalFormscoccyxchicken limbsduring developmenterector pilliVestigial organsExtra digitsEvidence for EvolutionFossilsExtinctionVestigial organsFossil stingless bee in Dominican amber(Proplebeia dominicana)Change in ecological timeCommon ancestryHomologous structuresChange in Ecological Time(1910’s-1980’s)Soapberry bugDescent with modification4Descent from a common ancestorHomologous StructuresF&H Fig 2.1Structural homologies(1809-1882)(1823-1913)Charles Darwin Alfred Russel Wallace What is either (or both) of thesescientists principally known
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