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  • Created by: R
  • Created on: 24-03-13 09:57

Allopatric speciation

Geographical separation

  • An outside source effects breading of a speices, 
  • Great distance, or a actual barrier (river or desert)
  • Each section may evolve changing characterstics creating two new speices


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Sympatric speciation

Reproductive barrier

  • Most commonly through polyploidy; offsprind have twice the normal number of chromosomes creating reporductive isolation
  • Same habitat but genetically different
  • Prevents fertiallization from happening 
  • Premating or Postmating (not mating at right time) 


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Bethany Cunningham

Thanks for this resource, it is really helpful as this isn't covered in many of the textbooks but you spelt 'species' and 'breeding' wrong, apart from that, it was great!

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