CB4c - Classification

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  • CB4c - Classification
    • organisms are classified into smaller and smaller groups (based on their characteristics)
      • as the characteristics of the organisms became more and more similar, the groups became smaller and smaller
    • species - Africana
    • genus - Loxodonta
    • the five-kingdom system of classification
      • 3) fungi
        • cell walls contain chitin (not cellulose)
        • live in or on the dead matter on which they feed
        • cells have nuclei
        • multi-cellular (apart from yeasts)
      • 5) prokaryotes
        • flexible cell walls
        • unicellular
        • cells do not have nuclei
      • 4) protists
        • mostly unicellular (a few are multi-cellular)
        • cells have nuclei
        • some have cell walls (made of different substances but not chitin)
      • 1) animals
        • cells have nuclei
        • no cell walls
        • multi-cellular (with cells arranged as tissues and organs)
      • 2) plants
        • have chloroplasts for photosynthesis
        • cellulose cell walls
        • multi-cellular (with cells arranged as tissues and organs)
        • cells have nuclei
    • the three-domain system of classification
      • archaea
        • cells with no nucleus
        • genes contain unused sections of DNA
      • bacteria
        • cells with no nucleus
        • no unused sections in genes
      • eukarya
        • animals
        • fungi
        • protists with flagella
        • plants
        • protists with cilia
        • cells with a nucleus
        • unused sections in genes
    • genetic analysis - the overall process of studying and researching genetics and molecular biology
    • biologists often now classify organisms into the three domains
      • this is because the three-domain system was a better and more suitable way of classifying organisms


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