How is alzheimer's inherited?

Depends: Early onset illness is inherited at a high rate but the more common late onset alzheimers has a number of genes taht increase risk a small amount each.

Autosomal Dom: In 2-5 % of cases there is a familial autosomal dominant pattern, associated with three more common mutations. Amyoid precursor protein, presenilin i, and presenilin ii. The disease presents often in the 30's and 40's in these groupsl.

Not yet known: Many details about the genetics of ad are known as colleagues indicate, it remains an area of research and competing hypotheses (see http://www.Alzheimersblog.Org/tag/genetic/?Gclid=clddgfsv5lucfy07ogodkhmazw). Like most human conditions many genes appear to influence ad. This yields a "risk" model, where certain conditions elevate the likelihood of offspring having ad without guaranteeing it.