What is the difference between the blood types, A, B, and O? a. A and B individuals have carbohydrate trees on the surface of red blood cells. O individuals do not have carbohydrate trees. b. For each blood type, A, B, and Othere is a different sugar attachment enzyme produced. c. A and B individuals have different modifications made to their carbohydrate tree. O individuals have no modifications made to their carbohydrate tree. d, The glycosyl transferase gene has a different mutation in A individuals than in B individuals. O individuals have no mutations in the glycosyl transferase gene.