BIO Chapter 24

BIO Chapter 24 - Chapter 24 Friday, January 23, 2009 2:08...

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Unformatted text preview: Chapter 24 Friday, January 23, 2009 2:08 PM T HE OR IG I N OF SPECIES 1. Concept 24.1 : The biological species concept emphasizes reproductive isolation o Species: Latin for "kind" or "appearance" 2. The biological species concept o Defines a species as a population or group of population 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 known regarding their reproduction 3. Speciation o Dependent on: Reproductive isolation Genetic divergence 4. Establishing reproductive isolation 5. Reproductive isolation o The existence of biological factors that impede members of 2 species from producing viable, fertile offspring o Prezygotic barriers o Postzygotic barriers 6. Prezygotic bar riers o impede mating between species or hinder the fertilization of ova if members of different species attempt to mate 7. Postzygotic Bar riers o Often prevents the hybrid zygote from developing into a viable, fertile adult...
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This note was uploaded on 01/29/2009 for the course BIOL 1202 taught by Professor Gregg during the Spring '08 term at LSU.

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BIO Chapter 24 - Chapter 24 Friday, January 23, 2009 2:08...

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