Everybody has a blood type. The most common blood type classification system is the ABO (say "A-B-O") system discovered by Karl Landsteiner in the early 1900s. The differences in human blood are actually due to the presence/absence of certain protein molecules known as antigens and antibodies. Individuals have different types and combinations of these molecules. The blood group that you belong to, depends on what you have inherited from your parents. There are more than 20 genetically determined blood group systems are known today, but the ABO and Rh systems are the most important ones used for blood transfusions.
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DNA & Genetics
DNA & Paternity
