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  • chromosomes
    • the nucleus of a cell contains  chromosomes made of DNA
    • each chromosome carries hundreds to thousands of genes
    • different genes contain the code to make different proteins and so control the development of different characteristics
    • in body cells the chromosomes are found in pairs with one chromosome coming from each parent
    • different species have different numbers of pairs of chromosomes
      • e.g. humans have 23 pairs dogs have 39 pairs


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