Why do common diseases such as allergy and asthma have complex patterns of inheritance while other, relatively uncommon diseases approximate simple Mendelian traits? There is good evidence that the dysfunctioning of highly involved, interactive genetic networks is implicated in most complex diseases. Here, Kathleen Barnes and David Marsh review recent studies of asthma, which provide a good model for illustrating this point.
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Barnes et al. (1998) studied this question.
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