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Differences in the family

Our history is written in our genes. Your genes tell your body how to make all the different proteins it needs to survive, develop and grow. A change (DNA mutation) in a gene can alter what it does, so the body makes a slightly different protein. Different versions of genes are called alleles. The types and numbers of alleles in a population can provide clues about the lives of our ancestors: their diet and the diseases they encountered.

Different versions of several genes influence eye colour.
Different versions of several genes influence eye colour.
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