Knowing the blood type of parents, how to judge the blood type of children?

For example, if the father is type O and the mother is type O, then the child's blood type must be type O. This is that a child's blood type can be predicted by his parents' blood type. Let me talk about the principle.

A child's blood type is inherited from his parents, and the parents' genes combine to become the children's genes. Blood type genes include A, B and I, and each father and mother gives their children a set of genes.

Children have six genotypes: AA, Ai, BB, Bi, ii and AB. Among them, A and B are dominant genes, and I is recessive gene, that is, Ai and Bi show blood groups A and B, and I gene has no effect, while AB genotype people, A and B are dominant genes, showing blood groups AB. Therefore, type A blood includes AA and Ai, type B blood includes BB and Bi, type O blood genotype is ii, and type AB blood genotype is AB.

Of course, blood type inheritance can't depend entirely on the following table, and there will be some special circumstances. For example, cisAB blood group (cis AB), AB gene comes from the same person, so parents of type AB and type O will give birth to children of type AB or type O.. There are other factors that may affect blood group inheritance, and we should also treat children's blood group inheritance correctly.

Extended Data The first person in the world to discover the blood type of red blood cells was Landsteiner, an assistant professor at the University of Vienna, Austria, 1900. This epoch-making discovery provides an important guarantee for safe blood transfusion in the future. For this reason, he won the Nobel Prize of 1930 and won the reputation of "father of blood type".

At first, he only discovered three types of human red blood cells, A, B and C. In 1902, his students Decastello and Sturli discovered the fourth type except A, B and C. Later, the League of Nations Health Care Committee officially named these four types as A, B, O and AB, which is now known as ABO blood group system of red blood cells.

Refer to Baidu Encyclopedia Blood Group Inheritance Law.