Huntington's chorea involves progressive mental and physical decline in people between the ages of 30 and 40 and is caused by a dominant lethal gene.

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Huntington's chorea, also known as Huntington's disease, is indeed caused by a dominant lethal gene and typically manifests in adults between the ages of 30 and 40, leading to progressive mental and physical decline.

Huntington's Chorea Involves Progressive Mental and Physical Decline in People