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  • Created by: emma
  • Created on: 07-04-14 21:43
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  • Classification
    • System
      • Organisms placed into taxa groups and they can only belong to one group at each level
        • Kingdom, phylum, class, order, family, genus, species
        • Creates hierarchial system
          • Groups within groups with no overlapping
    • Species
      • A group of similar organisms able to reproduce and produce fertile offspring
    • Phylogenetics
      • Study of patterns of evolutionary history/ relationships
      • Organisms which shared the same common ancestor more recently are more closely related
    • DNA hybridation
      • DNA from two species you want to compare
        • Heat to separate strands (break H bonds)
          • Add radioactive label to DNA strand from on species
            • Mix DNA and cool producing DNA hybrids
              • Increase temp in small increments
                • Measure amount of hybrid DNA which is still double stranded
              • The more similar the DNA sequences the more hydrogen bonds formed meaning more heat is required to break them apart
    • Immunological comparison
      • Inject protein into animal
        • Obtain antibodies
          • Add protein from other species
            • Amount of precipitate indicates relationship
    • Courtship behaviour
      • Attracts same species
      • Attracts opposite sex
      • Indication of sexual maturity
      • Stimulates release of gamets
      • Form a pair bond
    • Plants
      • Based on DNA sequences of 3 genes found in all plants
        • Phylogenetic tree showed how species have evolved into natural groups
          • Using homologus species


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