@Freedom2B @w7voa that I understand. But that isn't quite my question. My question is that if I see an organism, and study the organism, does it help me to know about the organism's genetic code better if I know it's origin from a host in the past? Or will modern gene sequencing make that knowledge superfluous?

I'm physics, not biology, and I have a tendency to look at things in situ. That may not be the correct term... I mean in the place they are now, in the state they are now. Previous conditions just seem irrelevant to me. If looking at f=ma, stdying a rock in motion, there are no terms that apply for what happened to that rock yesterday.