Well the answer to this is quite complex…. The problem is this. We know that less than 2% of the human genome codes for protein. So what does the other 98% do? Some of it is involved in the control sequences that tell the cell which genes to read and when, but that probably still leaves around 80% with no known function. Is this “junk DNA” just hitching a ride alongside successful genes? Or does it play a function as yet unknown…. There is still loads for scientists to work out when it comes to DNA – it is a new and constantly changing science. That’s what makes it so exciting!
PMG Biology 
The video infers that DNA does more than code for protein;what else does DNA do
Well the answer to this is quite complex…. The problem is this. We know that less than 2% of the human genome codes for protein. So what does the other 98% do? Some of it is involved in the control sequences that tell the cell which genes to read and when, but that probably still leaves around 80% with no known function. Is this “junk DNA” just hitching a ride alongside successful genes? Or does it play a function as yet unknown…. There is still loads for scientists to work out when it comes to DNA – it is a new and constantly changing science. That’s what makes it so exciting!