How Do Blood Types Work?

Blood types blood type Why It's Important to Know Your Blood Type · There are four blood types: A, B, AB, and O Each blood type also has a positive or negative blood group Genetics of the ABO System The ABO blood group system is controlled by a single gene on chromosome 9 There are three common alleles for the

blood type Read on for more A blood type facts such as compatibility: · 6% of the population has type A-negative blood · Type A-negative blood can be transfused to all A