The Autosomal dominant reference article from the English Wikipedia on 24-Apr-2004 (provided by Fixed Reference: snapshots of Wikipedia from wikipedia.org)

Autosomal dominant

An autosomal dominant gene is an abnormal gene on one of the autosomal (non-sex determining) chromosomes. Because it is dominant, it need only exist in on the inherited chromosomes of one parent for it to cause disease. The chances of an autosomal dominant disorder being inherited are 50%. Some diseases inherit in this fashion but still affect less than 50% of the offspring; in this case the disease is termed of having incomplete penetrance.

Other forms of inheritance are: autosomal recessive, X-linked and mitochondrial.

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