Familial Alzheimer's __________.
A) typically appears after age 65
B) progresses more slowly than sporadic Alzheimer's
C) is responsible for 1 percent or fewer cases
D) is caused by an abnormal gene on chromosome 19

Question

Quizplus · Accepted Answer

Familial Alzheimer's disease is a rare form of Alzheimer's, accounting for 1 percent or fewer of all cases. It is caused by mutations in specific genes (notably PSEN1, PSEN2, and APP) on chromosomes 21, 14, and 1, respectively, not chromosome 19, which is associated with the APOE gene linked to the more common sporadic form of Alzheimer's. Familial Alzheimer's typically appears before age 65, often much earlier, and its progression can vary.