Cards (4)

    • what is speciation
      speciation is the development of a new species
    • when does speciation occur
      speciations occurs when populations of the same species become so different that they can no longer sucsessfully interbreed to produce fertile offspring
      • isolation is where populations of a species are seperated
      • can happen due to a physical barrier eg floods + earthquakes
      • conditions on either side of the barrier will be slightly different
      • because of different environment, different characteristics will become more common in each population due to natural selection they are better adapted to their environment so they can have better chance of survival and reproduction
      • eventually individuals from the different populations will have changed so much that they wont be able to breed with one another to produce fertile offspring
      • diff species
    • alfred russel wallace
      • came up with idea of natural selection and published work with darwin
      • he realised that warning colours are used by some species to deter predators from eating them eg butterflies and that this was an example of a benificial characteristic that had evolved by natural selection