How was the theory of evolution developed?

There is variation between members of every species. You are different to everybody else. Even identical twins have differences between themselves and others. Some of these differences are down to differences in our genes which can be created by mutations and some is down to the environment. This unit focuses on genetic variation and how this can lead to evolution.

It is important that you understand by the end of this unit…

  • It is important that you understand…

    • How mutations can cause variation between organisms.
    • How some mutations can lead to phenotypes that are naturally selected in the environment.
    • How natural selection can lead to evolution and the formation of new species.
    • How some plants and animals can be selectively bred.
    • How antibiotic resistance is an example of modern evolution.

Darwin's Finches

Image from Wikimedia Commons

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B6   Variation within species