Children born to a father with AB blood type and a mother with B blood type are categorized as having blood types A, B, and AB.
Blood type is a classification based on the difference of the homologous antigens on the surface of human red blood cells, and blood is classified into four blood types: A, B, AB, and O, depending on the agglutinins contained in the red blood cells. From the genetic point of view, if the parents have blood types A and AB, the children born to them can only have blood types A, B or AB, and it is impossible to have blood type O. The blood types of the parents and the children are categorized according to the differences in the antigens contained in the red blood cells.
By analyzing the blood types of parents and children, it is possible to know the blood type of the parents or children, which can be used as a basis for medical treatment, based on the principle of Mendel’s law.
Since the table of blood group inheritance laws covers a wide range of blood groups, it is necessary to consult a doctor to analyze the details.