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Chapter 3

BIOL 359 - Chapter 3 Readings

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Department
Biology
Course
BIOL 359
Professor
Jonathan Witt
Semester
Fall

Description
Chapter3EvolutionbyNaturalSelectionInOntheOriginofSpeciesDarwinarguedthatnaturalselectionwasthemechanismbywhichdescentwithmodificationwasmadepossibleoWCWellsusedittoexplainhowhumanpopulationsondifferentcontinentsdifferedinappearanceanddiseaseresistanceoPatrickMatthewdiscusseditinrelationtotreesoAlfredRusselWallacediscovereditataroundthesametimeasDarwinNaturalselectiondependsongeneticinheritanceandisexaminedinastatisticalmannerArtificialSelectionDomesticAnimalsandPlantsCrossbreedindividualswithmostdesirabletraitsinhopesthattheywillbepassedontothenextgenerationOrganismswithtraitsfavouredbyhumanstendtofarepoorlyinthewildEvolutionbyNaturalSelectionDarwinhadfourpostulatesaboutthenatureofpopulationsoIndividualswithinapopulationdifferfromeachotheroDifferencesarepassedonfromparentstooffspringoSomeindividualsaremoresuccessfulatsurvivingandreproducingthanothersoAnindividualssuccessisduetothevarianttraitsthattheyhaveinheritedandwillpassontooffspringIfthepostulatesholdcompositionofpopulationwillchangefromonegenerationtothenextInheritedtraitsthatincreasepotentialforsurvivalandreproductionarepassedonmorefrequentlytooffspringthereforebecomemorecommoninapopulationSelectionhappenstoindividualsbutwhatchangesispopulationsDarwinianfitnessanindividualsabilitytosurviveandreproduceoNotnecessarilyphysicallyfitoMoreoffspringcontributedtonextgenerationmorefitAdaptationtraitthatincreasesanorganismsfitnessrelativetoindividualslackingitPostulatesaretestableandcanbeverifiedindependentlyTheEvolutionofFlowerColourinanExperimentalSnapdragonPopulationPostulate1IndividualsdifferfromoneanotheroofplantshadwhiteflowerswithtwoyellowspotsoResthadflowersthatwereallyellowPostulate2Variationisinheritedo121ratioofSSSssso31ratioofwhiteyellowPostulate3DoindividualsvaryintheirsuccessatsurvivingandreproducingoPlantsshowedvariationaspollendonorsandseedmothers
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