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Pedigrees show how characteristics are passed from one generation to the next. They are used in studying human genetics because it is not possible to carry out controlled breeding experiments with humans, as we can with other animals or with plants. Instead we have to use the natural 'experiments' carried out when people have children, and see which characteristics tend to run in a family. Of course, it is necessary to ensure that a characteristic is not caused by the common environment shared by members of the same family.

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