Do the tendency of multy Gene related illness follow normal distribution?

Answer 1

Gene Therapy: Molecular Bandage? University of Utah's Genetic Science Learning Center
The American Society of Gene Therapy
The European Society of Gene Therapy
2003 news relating to gene therapy
Research Group at Cambridge, UK working on an overcoming current hurdles to successful gene therapy
Council for Responsible Genetics
Retrieved from "http://en.wikipedia.org/wiki/Gene_therapy"

Answer 2

Researchers in the fields of cardiovascular disease, rheumatism and multiple sclerosis (MS) from Karolinska Institutet and the Centre for Molecular Medicine (CMM) in Stockholm, Sweden have together shown that there is a common risk factor for these conditions. It is the first identified gene to link autoimmune diseases with cardiovascular diseases.
Multigene diseases actually are influenced by a single mutant of each gene but in various permutations and combinations.
So expected heritability patterns do not occur

http://www.pharmaceutical-business-review.com/article_news.asp?gui