Part 1 of Essay
, or Huntngton's chorea, is a genetic disease that causes selective neural cell death, which results in chorea, or irregular, jerking movements of the limbs caused by involuntary muscle contractions, and dementia. It can cause a lack of concentration and depression. It also may cause atrophy of the caudate nucleus, a par ....

Part 2 of Essay
.... or other similar affliction, he or she might pass along the gene without even knowing it. The gene for Huntington's disease is located on the short arm of chromosome four in cytogenetic band 4p16.3. It was first identified in 1993. While everyone posseses this gene, in someone suffering from Huntington's disease, the number of repeats of a certain trinucleotide, cytozine-adenine- guanine (CAG), is much larger than what it is in a normal person. In an average person, the number of repeats is bet ....