Which of the following statements is incorrect?
 
| 1. | A person of ‘O’ blood group has anti ‘A’ and anti ‘B’ antibodies in his blood plasma. | 
| 2. | A person of ‘B’ blood group can’t donate blood to a person of ‘A’ blood group. | 
| 3. | Blood group is designated on the basis of the presence of antibodies in the blood plasma. | 
| 4. | A person of AB blood group is universal recipient. | 
ABO blood grouping in human is based on the presence or absence of two surface antigens on the RBCs namely A and B. Similarly, the plasma of different individuals contain two natural antibodies. This distribution of antigens and antibodies in the four groups of blood A, B, AB and O are as follows
Blood Groups and Donors Compatibility
| Blood Group | Antigens on RBCs | Antibodies on Plasma | Donor's Group | 
| A B AB O | A B A, B nil | anti-B anti-A nil anti-A,B | A, O B, O AB, A, B, O O | 
Thus, blood group in universal donar 4 blood group AB in universal recipient and the other options are correct.
 
                    
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