@Turjan - My apologies if I misunderstood what you meant by "But let's face it, the sentiments that sparked this thread ran more along the lines of a "perfect genetics" challenge." To me, it read as if you were saying, this thread went astray from my initial query and had become something else.
I play with the game's logic, it's what I am familiar with. Any talks or references to Sims and their genetic make-up, sliders or similarities within the family tree that are not personality related are pretty much lost on me. As I said, when I look at a Sim all I see is the possible potential in that Sim, the rest is just wrapping (to me) books/covers and all that jazz.