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  • Created by: Flo
  • Created on: 03-06-12 16:29

Speciation - formation of a new species.

There are two types; Allopatric and Sympatric.

Allopatric Speciation

Allopatric speciation - when a geographical barrier causes the formation of a new species.

1. Parent Population can move freely around area. Free gene movement between individuals (can interbreed)

2. Geographical isolation (e.g. mountain range/Ocean);

Parents part of population causing geographical barrier. Isolated groups prevented from interbreeding with parent population

3. Different selective pressures (e.g. climate);

Certain random mutations favoured which leads to natural selection; now a sub species.

4. If barrier remains (e.g. B) sub-species continues to evolve differently due to


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