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ch24 - Chapter 24 The Origins of Species Species Biological...

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Chapter 24 The Origins of Species Species Biological Species Concept o A population whose members can potentially interbreed in nature to produce a viable offspring Reproductive barriers o Isolate populations from one another o A complete barrier would result in no gene flow o An incomplete barrier could still reduce gene flow Prezygotic vs. Postzygotic Prezygotic barrier impede mating or hinder fertilization if mating does occur Postzygotic barrier prevent a hybrid zygote from developing a viable, fertile adult Reproductive barriers Prezygotic o Habitat isolation Geographic isolation Ecological isolation o Behavioral isolation (mate choice) o Temporal isolation o Mechanical isolation o Gametic isolation Postzygotic o Reduced hybrid viability o Reduced hybrid fertility Hybrid sterility (in the extreme) o Hybrid breakdown Reduced viability or fertility occurs in the offspring of the hybrids Speciation The process by which new species form
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