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Unformatted text preview: CHAPTER 24 THE ORIGIN OF SPECIES Species: Latin for “kind” or “appearance” Biological Species Concept • Defines a species as a population or group of population of populations whose members have the potential to interbreed in nature to produce viable, fertile offspring • Cannot be applied to o Asexual organisms o Fossils o Organisms about which is little is known regarding their reproduction Speciation Dependent on o Reproductive isolation o Genetic divergence o Isolated population diverges – if they come back together, they can no longer reproduce Reproductive Isolation • The existence of biological factors that impede members of two species from producing viable, fertile offspring o Prezygotic barriers- prevent zygote forming – keep gametes from coming together -- Ex (does not mate) :- (Habitat Isolation) species living in the same place but different habitats- (Temperoal) different breeding time of the year - (Behavioral Isolation) different behaviors – behaviors are unique to a different species. – enable mate - (Behavioral Isolation) different behaviors – behaviors are unique to a different species....
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- Spring '08