There are differences and tendencies among different people from different parts of the world. I learned about it in my Biology class.
About halfway down this page, read "Blood Groups Differ Around the World"http://www.ncbi.nlm.nih.gov/bookshel...tigen&part=ch2
The distribution of the four ABO blood types, A, B, AB, and O, varies in populations throughout the world, therefore certain populations of people have a greater % of a certain blood type. . . however,
|These patterns of ABO and Diego blood type distributions are not similar to those for skin color or other so-called "racial" traits. The implication is that the specific causes responsible for the distribution of human blood types have been different than those for other traits that have been commonly employed to categorize people into "races."
Also, this website has some good maps at the bottom.http://anthro.palomar.edu/vary/vary_3.htm
Here's a fun tool if you know either (a) one parent and the child's blood type or (b) both parents' blood types.http://www.biology.arizona.edu/human...pes/Intro.html