Here's why:
* Autosomal: The gene responsible for the disease is located on an autosome, which is a non-sex chromosome (chromosomes 1-22 in humans).
* Dominant: Only one copy of the mutated gene is needed for the disease to manifest. This means that if a person inherits the mutated gene from one parent, they will develop the disease, even if the other parent has the normal gene.
Example: Huntington's disease is an autosomal dominant disorder.