Genes, Chromosomes & DNA

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  • Genes, Chromosomes & DNA
    • Most cells in your body have a nucleus
      • It's the nucleus that contains your genetic material
    • The genetic material in the nucleus is arranged into chromosomes
      • The human cell nucleus contains 23 pairs of chromosomes
    • Each chromosome is one very long molecule of DNA
    • A gene is a short length of a chromosome
    • Genes control the development of different characteristics
      • E.g. Hair colour and how an organism functions
    • Genes can exist in different versions
      • Each version gives a different form of characteristic
        • Like blue or brown eyes
      • Different versions of the same gene are called alleles


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