Which of the following types of dementia is thought to share a genetic basis with Down syndrome?

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Alzheimer's disease is the type of dementia that is thought to share a genetic basis with Down syndrome. People with Down syndrome have an extra copy of chromosome 21, which includes the gene that produces a protein called amyloid precursor protein (APP). This protein is also found in the brains of people with Alzheimer's disease, and it is believed that the excess production of amyloid beta protein, a peptide that is derived from APP, can contribute to the development of dementia in both conditions.

Which of the Following Types of Dementia Is Thought to Share