I/GCSE Biology - Evolution

Edexcel Biology Evolution

· igcse biology,gcse biology,edexcel,evolution,natural selection

Natural selection

  • Individuals of a species show variation - some individuals will be better able to survive in the environement and produce more healthy offspring than others - natural selection.
  • This is when the environment ( including climate and other organisms) selects which individuals pass on their genes to the next generation
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Evolution

This is often asked in I/GCSE Biology

  • Charles Darwin suggested that, if the environment changes, then natural selection will result in the characteristics of a species changing gradually from generation to generation - Evolution

Diagram:

Environment changes - Different variations help individuals to survive and produce more young (e.g. thicker fur/more fat) - Characteristics of species gradually change from generation to generation (e.g. all individuals have thicker fur/more fat)

  • Recent studies of DNA show that organisms that have the most similar DNA are the most closely related. - Predicted by Darwins theory
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Drafted by Catrina (Biology)

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