Subject: Alzheimer's and Parkinson's--a cure, a corelation?

What percent of people diagnosed with Alzheimer's disease (AD) 
eventually develop or were misdiagnosed with Parkinson's disease (PD) 
and vice versa.  Is it possible that AD has many symptoms including 
the symptoms that are observed through PD. Could it be that PD is a 
symptom of AD? Many patients with AD often have PD as well.  There 
has to be some directly corelation between the two, this just isn't a 
coincidence.  What are the most recent steps being taken for these 
two diseases to have a cure?  And also, is there any proof that these 
diseases are mitochondrially gene-linked or are these diseases that 
genes can skip generations?  I thank you for all who take the time to 
read and respond to this ever so important topic!

Re: Alzheimer's and Parkinson's--a cure, a corelation?