Watson and Crick won the Nobel prize for demonstrating that a gene was composed of strings of dna arranged in the structure of a double helix. Some of these strings have been since associated with genetic changes which effect development--some haven't. It's led to speculation about possible "junk" dna sequences and all sorts of things. In any case, the dna is a kind of code, similar to the binary codes of computers.
I've just given you, in a few sentences, the sense of literally thousands of scientific studies related to dna. It certainly is reasonable for anyone to speculate further about the role of this code.