HideShow resource information
View mindmap
  • Evolution
    • More then 3 billion years ago, life on earth began as simple organisms from which all the more complex organisms evolved (rather than just popping into existence)
      • Animals move about the place and cant make their own food
      • Plants make their own food by photosynthesis and are fixed to the ground
      • Microorganisms are different to plants and animals eg bacteria are single celled
    • Natural selection
      • Mutation
        • This is a change in the organisms DNA
          • Most of the time mutations have no affect but sometimes they can be beneficial eg help with surviving or breeding
            • If so, the beneficial mutation is more likely to be passed on to the future generation by natural selection
              • Over time the beneficial mutation will accumulate in a population
    • Why people question evolution?
      • Darwin couldn't give a good explanation about how new characteristics appeared as genes and mutations wernt discovered til 50 years later
      • There wasn't enough evidence  to convince many scientists
      • It went against common religious beleifs about how the earth developed-first plausible explanation for exsistence without God.
    • Lamarcks theory
      • He argued that if a characteristic was used a lot by an organism then it would become more developed during its lifetime
        • He believed this would then be passed on to the next generation
      • This has now been rejected because if you dye an animals hair pink its offspring will still be born with the natural fur colour


No comments have yet been made

Similar Biology resources:

See all Biology resources »See all Evolution, extinction and natural selection resources »