AQA GCSE Biology Unit 1 8.1 Evolution

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  • Evolution
    • Dawin
      • All species of living things have evolved from simple life forms that first developed more than 3 billion years ago
        • Only gradually accepted because...
          • Inheritance and variation was not known
          • challenged the idea that God made life
          • insufficient evidence
        • Natural selection (evolution)
          • (Competition for survival)  Species show a wide range of variation because of differences in their genes
            • individuals with characteristics most suited to the environment  survive and reproduce
              • A new species is created
                • Better gene becomes more common in the population
            • new forms of a gene result from mutation leading to rapid changes in species if the are better adapted to that environment
              • A new species is created
                • Better gene becomes more common in the population
      • Evidence
        • Only a small proportion of off spring produced survive
        • species e.g dogs, pigeons, can be changed over time through selection by humans
    • Lamarck
      • Changes occur in an organisms lifetime and can be inherited
      • 'Giraffes were orginally short necked. But they lept stretching their neck to rech the leaves. They keep stretching until the neck becomes progressively longer

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