Final answer:
An advantage of genetic testing for Alzheimer's is early detection and intervention, but a disadvantage is anxiety and ethical concerns.
Step-by-step explanation:
An advantage of a genetic test that identifies genes in individuals that increase their probability of having Alzheimer's disease later in life is that it can provide early detection and allow for interventions or treatments to be implemented at an earlier stage. This can potentially slow down the progression of the disease and improve the quality of life for affected individuals.
However, a possible disadvantage is that knowing one's genetic predisposition to Alzheimer's can cause anxiety and distress. It may lead to unnecessary worry in individuals who test positive for the genes, even if they may never actually develop the disease. Additionally, there may be ethical concerns related to the potential misuse of genetic information.