Human Growth and Development / Unit 15 HGD 2148 short lesson, about 20 seconds
Early- and Late-Onset Alzheimer's
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The idea
Early-onset Alzheimer's, before sixty-five, is rare and linked to Down syndrome and three dominant genes; a parent with one gives a fifty percent chance of inheriting it.
In practice
Late-onset Alzheimer's, after sixty-five, accounting for most cases and progressing more slowly.
Where people slip
Late-onset cases are harder to predict, since no single gene determines them.
Your place on the trail
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