interesting thing about "mixed blood" vs. "pure"--
and yes, i am thinking of the more common meaning of pure, and not crossing threads

there are all over the world, populations that tend to remain pure-- island populations (particulary ireland) or ethic, (particulary east europian jews) -- some studies have shown these populations to be the most pure-- almost to a point of being inbred.

and it shows.. these population have a high percentages of inhertable genetic disorders..

the same thing showed up in the pharoahs of egypt, and in the royal families of europe.

the healthiest thing you can do for your children, grandchildren and future generations, is cross breed!