Science // Biology // B1 // Chromosomes, DNA, and genes //

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  • Genetics and DNA
    • Inside the nucleus and chromosomes
    • Definitions
      • Chromosome
        • 1000's of coils of genes
      • Genes
        • Comprise 'DNA' that decides our characteristics.
      • DNA
        • Deoxyribose Nucleic Acid (chemical)
    • A human egg cell and sperm cell contains 23 chromosomes
      • Embryo therefore contains 23 pairs of chromosomes
      • Each pair contains a gene from your mother, and a gene from your father
        • So each pair contains two "options" for a characteristic
          • These options are called alleles e.g gene = eye colour alleles = blue eye colour, brown eye colour ect
    • DNA and the Human Genome project


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