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Bio1201A: Evolutionary Forces.doc

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Department
Biology
Course
Biology 1201A
Professor
Richard Gardiner
Semester
Fall

Description
WheredoesgeneticvariationcomefromMutationsNondisjunctiondeletionsadditionstranslocationsinversionsduplicationinsertionspolyploidyRecombinationcrossoversIndependentassortmentRandomfertilizationMatepreferencerandommatingSourcesofnewallelesMutationsSpontaneousandheritablechangeinDNAInorderforamutationtocontributetofuturegenerationsoffspringsthenitmustoccuringametesRarerandomerrorsDeleteriousmutationsnegativeimpactontheindividualimpactssurvivalassociatedwithlowerfitnessAdvantageousmutationsExShellthicknesshigherchanceofsurvivalSomemutationsareselectivelyneutralaswellHowissomuchvariationpossibleifmutationsarerareandusuallyharmfulHomeoticgenesregulatetheexpressionofothergenesMutationsinregulatorygenesfordevelopmentcangeneratenewbodyshapesturninggenesonoffExturnonleggenetogrowalegShouldntselectionreducegeneticvariationAdvantageousmutationsshouldfixinapopulationfixationApopulationisfixedwhenthereisonlyonealleleOtherforcesthatmaintainvariationandcauseevolutionotherthannaturalselectionandmutationsSelectionInheritancepatternofallelescaninfluencerateoffixationandthereforedegreeofvariationThespeedatwhichvariationoccurseffectstheamountofvariationweseeinapopulationHigherfitnessselectedforlowerfitnessselectedagainstSelectionandfitnessareoppositeifselectionis08thenfitnessis02MaintainvariationinapopulationwhenitistherecessiveallelethatisbeingselectedagainstApopulationwillachievefixationwhenitisthedominantallelethatisbeingselectedagainst
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