ABO blood type hides the genetic code. The ABO blood group gene is located on chromosome 9, and the offspring inherit one gene from both parents. In other words, a person's blood type is half from his mother and half from his father. So knowing the blood type of parents can infer the blood type that the child may or may not have. All combinations of parental blood types that can produce offspring blood types are as follows:
A+A→A、O； A+B→A、B、O、AB； A+O →A、O； A+AB→A、B、AB； B+B→B、O； B+O→B、O； B+AB→B、A、AB； O+O→O； O+AB →A、B； AB+AB→AB、AB .
Blood type comparison table is as follows:
Extended data blood group
1, ABO blood group
ABO blood group divides blood into four blood groups according to whether there are A and B antigens on the erythrocyte membrane. Only antigen A is type A and only antigen B is type B on red blood cells. If two antibodies, A and B, exist at the same time, the principle is AB, and the two antigens are O. Human sera of different blood types contain different antibodies, but do not contain antibodies against autologous red blood cell antigens. For example, type A serum only contains anti-B antibodies ... In all ethnic groups in China, type A, type B and type O blood each account for about 30%, while type AB only accounts for about 10%.
2.Rh blood group
Human red blood cells with the same antigen as rhesus monkeys are called Rh positive blood groups, and those without such antibodies are called Rh negative blood groups. Among the Han nationality and most ethnic minorities in China, the Rh positive blood group accounts for about 99%, while the Rh negative population only accounts for about 1%. Rh blood group system is one of the most complicated red blood cell blood groups. At present, more than 40 kinds of Rh antigens have been found, among which D antigen has the strongest antigenicity. Therefore, red blood cells containing D antigen are usually called Rh positive, while red blood cells lacking D antigen are called Rh negative.
References:
Baidu Encyclopedia-Table of Blood Group Inheritance Rules