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TPO阅读42文本答案翻译
TPO阅读42文本答案翻译
TPO阅读42文本答案翻译
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TPO阅读42文本答案翻译
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TPO-42
GeographicIsolationofSpecies
BiologistErnstMayrdefinedaspeciesas“anactuallyorpotentiallyinterbreedingpopulationthatdoesnotinterbreedwithothersuchpopulationswhenthereisopportunitytodoso.”Akeyeventintheoriginofmanyspeciesistheseparationofapopulationwithitsgenepool(allofthegenesinapopulationatanyonetime)fromotherpopulationsofthesamespecies,,,the
TPO阅读42文本答案翻译
TPO阅读42文本答案翻译
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TPO阅读42文本答案翻译
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,,acreepingglaciermaygraduallydivideapopulation,oralandbridgesuchastheIsthmusofPanamamayformandseparatethemarinelifeintheoceanwatersoneitherside.
TPO阅读42文本答案翻译
TPO阅读42文本答案翻译
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TPO阅读42文本答案翻译
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TPO阅读42文本答案翻译
TPO阅读42文本答案翻译
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TPO阅读42文本答案翻译
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Howformidablemustageographicbarrierbetokeeppopulationsapart?-blowntreepollenisalsonothinderedbysuchbarriers,andtheseedsofmanyplantsmaybecarriedbackandforthonanimalsIncontrast,,theGrandCanyon,inthesouthwesternUnitedStates,separatetherangeofthewhile-tailedantelopesquirrelfromthatofthecloselyrelatedHarris’,withashortertailthatiswhiteunderneath,thewhite-tailedantelopesquirrelinhabitsdesertsnorthofthecanyonandwestoftheColoradoRiverinsouthernCaliforniaHams'antelopesquirrelhasamorelimitedrangeindesertssouthoftheGrandCanyon.
Geographicisolationcreatesopportunitiesfornewspeciestodevelop,,,inlessthantwomillionyears,smallpopulationsofstrayanimalsandplantsfromtheSouthAmericanmainlandthat
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