Every human being has a unique biological signal in his blood, which we know as blood group. But do you know how a person’s blood group is determined? How is it decided whether someone is negative or positive?
1. Identification
The identity of B blood group is not determined by lifestyle or diet, rather it is present in our DNA even before birth.
2. Genes received from both parents
When a baby is born, certain genes from both parents determine whether his blood group will be A, B, AB, or O, and whether he will be positive or negative.
3. ABO gene
Children inherit one ABO gene from each parent. These genes together decide whether the blood group will be A, B, AB, or O. It is important to note that the O gene is recessive.
4. Need for O gene
Therefore, two O genes are required to form this blood group, while A and B are dominant.
5. Identification of ABO group
ABO groups are identified by which antigens – small protein markers – are present on the surface of red blood cells. Presence of A antigen means group A, B antigen means group B, both means AB, and absence of both means group O.
