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Sample Page

The page below is a sample from the MediaLab course, Introduction to the ABO Blood Group System.

Learn about Compliance & CE courses available for clinical laboratories and individual medical technologists.

Inherited Antigens

A subgroup antigens are inherited, as are other ABO antigens with A1 being dominant over A2. Individuals who are phenotypically A1 may be genotypically A1O, A1A1, or A1A2. A phenotypically A2 individual may be genotypically A2A3. These alleles are passed to offspring in the same manner as other ABO antigens.

Weak variant forms of the B antigen (B3, Bx, and Bel) also exist, but are very rare.



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