Cystic fibrosis, sickle cell anemia, Tay-Sachs disease, phenylketonuria and color-blindness are diseases caused by gene mutations. Just like the mutation of genes causes diseases, other gene mutations actually protect from and mitigate other diseases. Both the causation and protection from diseases by genes and mutations thereof [which are a function of the human terrain] validate the germ terrain duality theory of disease.
Ayan Chatterjee is an Independent Researcher. Alumnus, College of Medicine University of Ibadan, Oyo State, Nigeria. Winner, 2004 NIIT Scholarship (Grade A++)