TPO-42GeographicIsolationofSpeciesBiologistErnstMayrdefinedaspeciesas“anactuallyorpotentiallyinterbreedingpopulationthatdoesnotinterbreedwithothersuchpopulationswhenthereisopportunitytodoso.”Akeyeventintheoriginofmanyspeciesistheseparationofapopulationwithitsgenepool(ime)fromotherpopulationsofthesamespecies,,,,,acreepingglaciermaygraduallydivideapopulation,’tknow?Lookthemupin《新托福TPO阅读词汇速查速记》!Wechat:geeqi0805Howformidablemustageographicbarrierbetokeeppopulationsapart?-blowntreepollenisalsonothinderedbysuchbarriers,andtheseedsofmanyplantsmaybecarriedbackandforthonanimalsIncontrast,,theGrandCanyon,inthesouthwesternUnitedStates,separatetherangeofthewhile-tailedantelopesquirrelfromthatofthecloselyrelatedHarris’,withashortertailthatiswhiteunderneath,thewhite-tailedantelopesquirrelinhabitsdesertsnorthofthecanyonandwestoftheColoradoRiverinsouthernCaliforniaHams',,,inlessthantwomillionyears,smal
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