If one of your parents has Huntington disease and is heterozygous for the disorder,you have a 50 percent chance of inheriting the disease.

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Huntington disease is an autosomal dominant disorder, which means that a child with one affected parent has a 50% chance of inheriting the disease. If the parent is heterozygous for the disease, they have one normal copy of the gene and one mutated copy. Each child has a 50% chance of inheriting either the normal or the mutated gene from that parent.

If One of Your Parents Has Huntington Disease and Is