DNA means Do Not Ask in medical terms.
Genes are the story.
Humans are made of 98% junk DNA.
Humans Do Not Ask 98% of the times and believe just as the doctor did what they were told.
Well you got bad genes in your family tree and have disease X, which is a disease that comes from people who listen to stories and believe them to be true. Their DNA (Do Not Ask) and genes (Stories) is what is creating all the junk.