A blueprint specifies every single dimension and every single detail of a building, from height to floor spacing to wiring and plumbing. DNA doesn't actually specify very much at all. That's not how it functions. It in fact does NOT proscribe every single detail of what an organism is going to look like and does not contain detailed instructions about how to create an organism.
Hmmm. They say that most of DNA is junk. What if those dead zones controlled which cell was which as the zygote grew, then shut themselves off so as appear dead & junk today.