I understand that you say “junk” dna in the context of the individual, but I’m curious if there could still be some selection pressure on this “junk”? For instance, I can imagine that “junk” which has more variety in it may generally result in more useful mutations, and this could put pressure on our “junk” to have high entropy, almost providing a source of randomness. I know very little about the field though — am i totally off base?