Barbarian, regarding where evolution gets purpose and direction:
Same place gravity gets its purpose and direction.
Selecting which genes will be available in the next generation for further evolution seem like a pretty creative thing.
Genes still need to be designed and developed.
Never saw anything designed in nature. Humans sometimes design genes, but they never seem to work as well as the ones God did naturally.
Designing a gene requires taking an existing gene and modifying it to some specified purpose. The natural way is for an existing gene, usually a duplicate of the original, to mutate repeatedly in the population, each time being preserved or removed by natural selection. At some point, it might become useful in a new way. Mostly, it doesn't, and just becomes yet another functional allele of the gene. That's why we have so many allles for each gene, even though we all came from a single pair of humans. The rest evolved over time. But not by design; God is a lot better than that.
Did the way that any of us lived our younger years impact the genes that we are passing to our offspring?
Maybe, but usually, just random variation happens. You have quite a number of mutations neither of your parents had.
Barbarian observes:
None of this has anything at all to do with atheism. God just did a much better job of creation than creationists are willing to admit.
Conventional science talks about "junk DNA"
Mostly, creationists do. The scientific term is "non-coding DNA." Some of it is junk; experiments in animals and plants show that huge stretches of non-coding DNA can be lost without noticable effect on the organism. But as far back as the 1960s, scientists were finding that some non-coding DNA has other functions. The problem is that creationists seem to think that if any of it is junk, then all of it has to be junk. That's not the case.
that appears to have no purpose. Could it be that the Intelligent Designer placed "dormant genes" into the genetic code that would express themselves in later generations?
No, it's more basic than that. He created, over millions of years, a genetic system that had built into it, the potential for almost limitless variety. The system can actually build new genes out of old genetic material, including non-coding DNA.
He uses nature for most things in this world, and that's a good example.
There's excellent evidence for the innate variability of DNA, and for the evolution of new alleles in the system He created.
The genome of the single-cell amoeba is 100+x times larger than the human genome. How did that happen?
Gene duplication. Amoebae vary a lot in the amount of DNA, depending on the kind it is. They aren't a single taxon, but are found in various lines of unicellular eukaryotes, and many are quite distantly related to each other. Unless duplication results in duplicated chromosomes, it doesn't usually cause any problems. Usually.