...so how do they not know that a gene doesn't skip a generation, but a genetic trait does. And, if it had skipped a generation and appeared in the next, it's not that special, because Duval's wife had to have had it to pass it on to Gracie.
Fighting a religious war is like fighting over whose imaginary friend is better.
1% of the US population is ~3 million people. 1%. The precursor is a 1 in 1 million thing, right? So... statistically (with everyone spread out equally and the precursor people sprinkled in perfectly), living in the state of Washington alone, there would be ~6 people with the precursor. Add in Oregon's ~3(.9) million and California's 38(.8) million, there would be ~47 people on the west coast with the precursor. Not just two.
Unless I did math wrong. That happens sometimes.
On another note, wouldn't Duval's wife only have to be a carrier of the precursor and not *have* to have it. It's still like a 1/4 chance, but...
Isn't it possible that the gene in this case ISN'T Mendelian? For example, eye color isn't Mendelian. You could have a person with blue eyes, but both his father and daughter have green eyes. Maybe the genetic precursor requires a specific combination of genetic markers. Most things aren't just one gene.