Chapter 24

Chapter 24 - 19:12 Chapter24TheOriginofSpecies

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19:12 Chapter 24 – The Origin of Species Concept 24.1: The biological species concept emphasizes reproductive isolation Species: Latin for “Kind” or “appearance” The Biological Species Concept o Defines a species as a population or group of populations  whose members have the potential to interbreed in nature  and produce viable, fertile offspring  o Cannot be applied to: Asexual organisms Fossils Organisms about which little is know regarding  their reproduction Speciation o Dependent on  Reproductive isolation Genetic divergence Reproductive Isolation o The existence of biological factors that impede members  of two species from producing viable, fertile offspring o Prezygotic barriers Impede mating between species or hinder the  fertilization of ova if members of different  species attempt to mate o Postzygotic barriers Often prevents the hybrid zygote from 
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Chapter 24 - 19:12 Chapter24TheOriginofSpecies

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