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9. Alzheimer's Disease

Late-onset Alzheimer's disease is another example of a complex genetic disease. The most common cause of dementia, Alzheimer's results in a gradual decline in cognitive ability, memory, learning, and organization skills. In time, it can negatively impact a person's ability to complete basic everyday tasks.

The link between genetics and Alzheimer's is strongest in cases of late-onset Alzheimer's, where symptoms begin to appear when a person is 65 or older.

Frustrated middle aged woman with walking disability looking in distance. fizkes/ Getty Images

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