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This inherit disease also called autosomal dominant trait.
It means one copy of an alter gene that cause a disease or disorder in one person is passed down from one of the affected parent.
A person who has biological mother or father suffers the early onset Alzheimer's disease, then this person has 50 percent chance for having the early onset Alzheimer's disease.
Sadly, if a person who has biological mother or father has a gene mutation of the early onset Alzheimer's, this person has 50 percent chance for having a gene mutation.
So, from the diagram above we can see how the genetic disease inherits from generation to the next generation.
Now, let's do math! If a mother (or father) has early-onset Alzheimer's disease has 2 children, one of the two will get Alzheimer's disease. When she/he has 4 children, then 2 of the children will have this disease,
Fortunately, this early-onset Alzheimer's disease is less common. There is 1 person from 10 person who suffer with Alzheimer's disease.
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