In one of the newsletters on your site, I believe its Newsletter 17 RH factor by Dr. Christopher, he explains that the negative RH is a symptom of toxicity.
"The Rh factor is a heredity susceptibility to toxicity of the bloodstream: it is not necessarily a lifelong burden inherited by generation after generation, but a temporary toxic condition of the bloodstream which can be remedied by first cleaning up the bowel and then the bloodstream."
So RH positive blood is a symptom of blood toxicity. I am curious, because he said the Rh factor can be reversed... just by eating right. I did a quick search and saw that pregnant woman can go positive during the pregnancy, then back to negative after. I know its trivial... because cleansing and eating right is all that matters. But I still think its interesting.