Allopatric speciation
Updated: 5/27/2020
Allopatric speciation
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Storyboard Description

Squirrels vs grand canyon

Storyboard Text

  • Example of Allopatric Speciation
  • Oh Bill, of course I'll marry you !
  • A
  • Population of squirrels separated by a geographical barrier: The valley of the Grand Canyon The population splits into 2 (A and B) and there is no gene flow between the two, they are in REPRODUCTIVE ISOLATION
  • We aren't cut out for long distance ! Its not you Bill, its me...
  • B
  • A
  • Each population is exposed to different conditions, natural selection occurs independently in the two populations and they adapt to the different conditions
  • B
  • Population A and B are small. As a result of the founder effect, genetic drift occurs and there is variation of frequency of different genotypes within the separate populations. Different traits are favoured in the separate environments as population A and B fill different niches. They take different evolutionary 'paths'
  • A
  • See ya!
  • B
  • A
  • Over time, the two populations become very different from each other genotypically and phenotypically and even when the populations do mix again they are not able to reproduce with each other
  • Who you calling a rat?!
  • That's one weird looking rat !
  • B
  • A
  • The two groups of squirrels have become different species and speciation has occurred! The birds in the area could move freely and hadno barrier, thus could interbreed as usual and did not experience speciation
  • Suckers!
  • B
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