term 2

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  • Created by: charlotte
  • Created on: 25-02-13 18:21
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  • lesson 2
    • key terms
      • natural selection
        • natural selection is one of the basic mechanisms of evolution.
        • stage 1. there is variation in traits
          • stage 2. there is differential reproduction
            • stage 3. there is heredity
              • stage 4. end results
      • genetic variation
      • intraspecific
        • individuals
      • interspecific
        • competition amongst other species
      • adaptive radiation
        • the emergence of a new species from a common ancestor introduced into a new environment
      • species
        • a species is a class of individuals having some common characterises or qualitys
          • its difficult to define a species because all living things are different
    • mechanism for evolution
      • there is variation within a population and organisms can potentially over produce
        • selection pressures (availability of food) increases competition and give advange to species with specific features
          • the best adaptions survive and reproduce, passing on the alleles giving them a survival of the fittest
            • over time the allele frequency in the population change
  • natural selection is one of the basic mechanisms of evolution.

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