What exactly is Huntington's Disease.?

Huntington's disease is a disorder passed down through families in which certain nerve cells in the brain waste away, or degenerate. this disease causes disabilites that get worse over time. People usually die within 15 to 20 years after being diagnosed. Cause of death is usually infection or suicide. Individuals with Huntington’s Disease have one dominant Huntington’s allele and one normal allele. It is unusual for a person to inherit two dominant Huntington’s alleles because this would mean both that person’s parents have Huntington’s. There is a 50% chance that a parent with Huntington’s will pass the gene on to his or her children. This disease is found on chromosome 4 and it is autosomal dominant.