Thanks, REteach!  I did notice the dig aimed at you regarding your "credentials" earlier.  Your explanations are spot-on.  It is telling that no attempt was ever made to answer any of the informative questions you posed.

It is a curious phenomenon that the racialization theory of genetic diversity within human populatons was based, of all things, on skin color: "Caucasian" for White, "Negro" for Black, "Asian" (previously "Mongoloid", then "Oriental") for Yellow, "American Indian" for Red, and "Malayan" for Brown. 

Getting back to that so-called "sickle cell gene", what's funny is that those of Mediterranean ancestry who DON'T carry the sickle cell allele, have EXACTLY the same gene for hemoglobin as Whites in England and Yellows in China.  If anything, that shows genetic variation within groups, not between goups.  Same is true for all the other genetic diseases that are caused by alleles of human genes, as you know! 

Done here!  Sorry again, to fodaoson.