Let's say you have a blood type A+ living in Iceland needing a blood transfusion. Well, you may need to go to Norway to get your blood transfusion. A study has shown that there is a difference in frequency of the blood types in different races and countries. European descendents have a high A frequency and a very low B frequency. However, Asians have both high A and B frequency. This happened because different ethnic groups married within villages and ethnic groups; they did not mix frequently way-back-when. With globalization, it's going to be interesting to see how the frequency changes within the next 100 years. Below is a table that shows the distribution of blood type frequencies within different countries.