Outline Evolution III - APEvolution OriginofSpecies

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AP Evolution Origin of Species Macroevolution  considers the origin of new taxonomic groups   species Species   o a population or group of populations whose members can interbreed to produce  viable fertile offspring o species are maintained  by  reproductive barriers  not geographic barriers I. prezygotic barriers       prevent mating or fertilization 1. temporal isolation 2. habitat isolation 3. behavioral isolation 4. mechanical isolation 5. gametic isolation II. postzygotic barriers       prevent the development of viable fertile adults 1. reduced hybrid viability 2. reduced hybrid fertility 3. hybrid breakdown/ F 2  fitness Modes of Speciation o whenever reproduction isolation develops, speciation occurs 1.  allopatric speciation new species result when populations that are geographically  separated 2.  sympatric speciation reproductive isolation develops and new species arise 
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Outline Evolution III - APEvolution OriginofSpecies

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