There are cases when after the birth of a child, young parents, upon learning of his blood group, experience conflicting feelings, thinking that their child has been replaced, because neither the father nor the mother has a blood group that matches the child's.
Often parents are interested in the question of how to recognize the child's blood type (possible combinations). It turns out that today you can do this by knowing the parent blood groups.
Let's try to figure it out. First, let's look at the history of the discovery of blood groups. There was this event in the early twentieth century. The Austrian Karl Landsteiner drew attention to the fact that when mixing several people's blood, red blood cells can behave differently: in one case they stick together, and in the other, such a reaction is absent. This prompted the scientist to think that there are compatible and incompatible groups of blood. This discovery was of great importance, because due to the knowledge of the compatibility of certain groups, it was possible to safely transfuse it.
Two decades later, scientists learned about the inheritance of groups from parents, which occurs in accordance with the laws of genetics, discovered by G. Mendel. Like any sign of heredity, the blood group is determined in accordance with the fact that one gene from the pair is passed from the parents. Thus, parents transmit not a ready group, but only one gene, on the basis of which the baby's blood type is formed, which does not always coincide with the parent.
There are several different classifications of blood groups, but the most common is the AB0 system, which includes 4 blood groups.
How do you know the blood type of a child based on the parent's blood groups? It's simple, you need to turn to the law of inheritance of genetic traits.
1 group, the same zero, is denoted by 00. In this group there are two identical genes obtained from each parent. The first group in the child does not mean that the parents have the same group, but the gene 0 must be present in it.
2 group is designated by the letter A. This variant of inheritance is possible not only when parents have also 2 groups, but also if a zero gene is inherited from one of the parents, which has a characteristic feature: it is unable to manifest itself in the presence of A And B proteins.
Group 3 (B) is formed by the inheritance of one gene B from the parents or in the case of a combination of B0 genes.
When the child inherits from the parents one gene A, and the other B, which are equal to each other, the 4th group (AB) is formed.
All the above is presented in the form of a table.
| Mother's blood group ||Father's blood group|
|1 (00)||2 (0A, AA)||3 (0V, BB)||4 (AB)|
|1 (00)||1 (00)||1 (00), 2 (0A)||1 (00), 3 (0B)||2 (0A), 3 (0B)|
|2 (0A, AA)||1 (00), 2 (0A)||1 (00), 2 (0A, AA)||1 (00), 2 (0A), 3 (0B), 4 (B)||2 (0A, AA), 3 (0B), 4 (BB)|
|3 (0V, BB)||1 (00), 3 (0B)||1 (00), 2 (0A), 3 (0B), 4 (AB)||1 (00), 2 (0B, BB)||2 (0A), 3 (0B, BB), 4 (AB)|
|4 (AB)||2 (0A), 3 (0B)||2 (0A, AA), 3 (0B), 4 (AB)||2 (0A), 3 (0B, BB), 4 (AB)||2 (AA), 3 (BB), 4 (AB)|
We hope that our table "How to know the blood type of a child, knowing the blood groups of both parents" will help to understand this issue. Perhaps the doubts of some parents will also be divorced after studying it.
It turns out that the question of how to recognize a blood group has a fairly simple answer. It is possible, based on the knowledge of blood groups of parents, to calculate their own (although not one option is possible), or, on the contrary, to calculate the maternal and paternal blood groups, based on knowledge of the children's blood group. And in order to get accurate information, you need to take a blood test for a blood group at donor points or clinics.