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In general "we may regard supernumeraries as a very special category of genetic polymorphism which, because of manifold types of accumulation mechanisms, does not obey the ordinary Mendelian laws of inheritance." (White 1973 p173)
Genetic association studies that have uncovered the same polymorphisms in people with asthma and COPD provide support for the notion that the two conditions share some biological characteristics; implicated genes include ADAM33, CCL5 and IL17F.