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Where are the genes for blood type ABO located?
Quick Answer
The ABO blood group gene is located on chromosome 9. It helps determine whether a person has type A, B, AB, or O blood.
The Full Story
The gene that controls the ABO blood group system is located on chromosome 9. Different versions of this gene affect the sugar molecules added to red blood cell surfaces, producing A, B, AB, or O blood types. These inherited differences are important in transfusion medicine because incompatible blood can trigger dangerous immune reactions. The ABO system was first described scientifically in the early 1900s and remains one of the most important in medicine.
Key Facts
1.ABO is on chromosome 9
2.It affects red blood cell surface sugars
3.It is critical for safe blood transfusion
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