Speciation

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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

                                             (http://evolution.berkeley.edu/evosite/evo101/images/allopatric_beetles.gif)

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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) 

                                               (http://evolution.berkeley.edu/evosite/evo101/images/sympatric_beetles.gif)

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Comments

Bethany Cunningham

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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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