The allele that causes Huntington's disease is expressed earlier in life when it is inherited from the father than when it is inherited from the mother. Huntington's disease is an example of

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Huntington's disease demonstrates gene imprinting, where the expression of a gene depends on whether it is inherited from the mother or the father. In this case, the age of onset of the disease is influenced by the parent from whom the allele was inherited.

The Allele That Causes Huntington's Disease Is Expressed Earlier in Life