Genetic Diagnosis

Paper details:
This paper is for a Biology class. Topic is Genetic Diagnosis. The topic is very broad so we can go into a specific subject within the topic (of course we will need and introduction on what genetic diagnosis is). I will need citations, no less that 3 articles/sources and search for these should be made within Google scholar or NCBI Pubmed (http://www.ncbi.nlm.nih.gov/pubmed)