I am a 27 yr old female, B+ blood type as well as a mutt of 7 ethnic backgrounds. I am english, sicilian, irish, german, native american, scottish and scandanavian. I definitely don't look asian i look more like a really pale sicilian girl with a big honker lol. I dont think blood types tie into our ethnic backgrounds. There are eight principal types of blood; Phenotypes: A B AB and O. Then you have Genotypes: AA(AO) BB(BO) AB and OO. Depending on how you intertwine them you get different variations, hence the - and + types. There may be some confusion on your part when you look into certain blood types in ethnic backgrounds considering you're looking at the origin rather than the situation. For example if you realized that most B+ people have that blood type due to what continent they come from, such as asia/eurasia like you were saying, then how do you explain all the americans in the united states? There are plenty of ethnic backgrounds and a bunch of different blood types. What i'm trying to say is that the intertwining of blood makes up different types hence the reasoning behind my theory. I dont want to by any means sound racist but i believe that your theory is bases upon eurasian/asian relationships instead of inter-racial ones... I hope i was able to help.