Think what dNA actually do!!
They store knowledge and give it to next generation.
Let's take your phone , you store various data in files, i.e. Photos, videos,audio etc etc , but when you open gallary you get those in one place, that's DNA basically does , store data in a sequence that they help to bulid a full human body, mindset , same color as your parents.
Our body have such mechanisim to decode those information but think if we code decode them artificially, we can then prevent various abnormal condition of a human being. This project is HUMAN GENOME PROJECT.THANK YOU<<<<<<<<<<<