Reba said:
I'm not a geneticist, so I don't know "how" it's encoded.
I am sorry, but you seem to be kind of digging yourself a hole here. I think, if we try to see the concept of "sinful nature" being in the "seed of man" as more of a metaphor, what we can accept is that each human being has the capacity for harmful, evil behavior just because we are human. It is part of who we are, just as we have the capacity for sentient thought, compassion, kindness, love, etc. - that each of these are traits are simply aspects of what it is to be a human being. They have, in fact, isolated genes which predispose us to violence, extreme anger, alcoholism, and other negative or sinful traits. Not each person has each gene, but it seems prety much a part of human biology that we are capable of great evil. But of course, especially as adults, we have a choice as to whether we act on that or not.
For me, I can accept this as a case of science affirming Biblical statements, though science tries to remain neutral on labelling any gene as a "sin" gene - this would be where science would choose not to enter into the specific theology.
Incidentally, I am not locating any specific verses where sinful nature is described as being passed down on a "seed". Do you have and chapter/verse references I can look into? Thanks.