The blood groups of both father and mother affect the blood group of their child. Every parent might want to know the possible blood type of their child even before giving birth. The various blood groups such as A, B, O are quite complicated to understand if one does not know about them very well. That is because of existence of the O antigen. It is possible for a person to have not only A antigen but also antigen O even though his/her blood type is A. That person is supposed to be AA or AO genotype. Likewise, a person with blood type B can be BB or BP genotype. Although it is recorded on your IC as blood type B, your actual blood group can differ, with the possibility of being an AO type. For example....
| Genotype (DNA) | Blood Type |
| AO or AA | A blood type |
| AB | AB blood type |
| BO or BB | B blood type |
| OO | O blood type |
The reason why the blood group of child can be O even both of the parents hold the blood group of A is because of the parents’ genotype being the AO. But the child born by both parents’ blood type being Os can ONLY have the blood type of O. This is because blood type O does not contain any A or B genotype.
The diagram below describes the possible blood groups of the child when the blood type of the father and the mother are known
The above diagram let us know the blood type of the father if the blood type of
the child and the mother are known
That’s all about the parents’ blood types and their child’s possible blood type.
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