Genes

• Genome


  The entire (all) genetic material of an organism
• Genome

  • Contains many levels of organisation
• DNA

  Double helix polymer, made up of two strands forming a twisted, ladder shape
• Gene

  A small section of DNA that codes for a sequence of amino acids, which combine to give a specific protein
• Chromosome


  Long strands of DNA coiled up

  
• Chromosomes contain many genes
• Human body cells contain 23 pairs of chromosomes, one of each pair coming from each parent