Genes, Chromosomes and DNA

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  • Genes, Chromosomes and DNA
    • NUCLEUS: most cells in body have one
      • Contains genetic material
        • In form of CHROMOSOMES
      • Human cell nucleus contains 23 pairs of chromosomes.
        • Two no.1s, two no.2s, two no.3s, etc.
    • Chromosomes carry GENES
      • Different genes control the development of different characteristics
        • e.g. hair colour
      • A gene is a short length of a chromosome...
        • ...which is quite a long length of DNA.
    • DNA is coiled up to form the arms of chromosome.
      • ...which is quite a long length of DNA.
    • There can be different versions of the same gene, which give different versions of a characteristic, like blue or brown eyes.
      • The different versions of the same gene are called alleles instead of genes.
  • A gene is a short length of a chromosome...

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