Unlike DNA, this code is fiendishly complex.
We should remember that DNA is but one part of the cell, whose processes allow for reproduction, as well as the anatomical and physiological events that define its role in the tissues and organ systems that constitute a living organism.
Ultimately, the reality is the creature itself, be it a cat or a cactus, participating in its environment. Each living thing demonstrates differences from others of its kind, within its own and in successive generations. Clearly, what Darwin observed was correct; the problem is with its interpretation then and now.
The issue now is the reductionism to the molecular, the claim that random changes in the genome could possibly result in all this diversity, each living thing, in harmony, within itself and its environment. What changes is the form of offspring, as total whole systems, from that of their progenitors. And, such differences are associated with what occurs in the parents’ environment. Analyzing the workings of the constituent parts reveals the awesome intricacies and magnitude of what occurs in life. While definitely, random changes can occur at any level of the structure, it is the unified whole that is a living thing that reproduces itself, having originated in the first of its kind.
We cannot scientifically know how creation came about, since with mankind, it ceased, in terms of bringing new kinds of things into existence. It’s not necessary that the first placental creature emerged from an egg. Either way, it was something new in the world, and not the final result of what would have to have been an infinitely long series of serendipitous changes to the DNA molecule, each step producing a viable phenotype. It seems to me, much easier to construct an adult form and then condense the very many components to get to the basic information, structure and processes necessary for an egg to develop into the particular creature-in-the-world.
