Type A× Type A: IAIA×IAIA=IAIA；; IAIA×IAi=IAIA、IAi； IAi×IAi=IAiA, IAI, II < P > Type A× O: IAIA×ii=IAi；; IAi×ii=IAi, II < P > Type A× AB: IAIA×IAIB=IAIA, IAIB; IAi×IAIB=IAIA, IAi, IBi, iaib

type b× type b: IBIB×IBIB=IBIB；; IBIB×IBi=IBIB、IBi； IBi×IBi=IBIB, IBi, ii

type b× o: IBIB×ii=IBi；; IBi×ii=IBi, ii

type b× ab: IBIB×IAIB=IBIB, iaib; IBi×IAIB=IBi, IBIB, IAIB, iai

type a× type b: IAIA×IBIB=IAIB；; IAIA×IBi=IAi、IAIB； IAi×IBIB=IBi、IAIB； IAi×IBi=IAi, IBi, IAIB, II < P > AB×O type: IAIB×ii= IAi, IBI < P > AB× AB type: IAIB×IAIB=IAIA, IBIB, IAIB

O type × O type: II× II = II < For example, under normal circumstances, people with type A blood transfusion and people with type B blood transfusion.

① In case of emergency, people with blood type AB can accept any blood type, and blood type O can be transfused to people with any blood type.

② under normal circumstances, considering that there are many types of human blood group systems, in order to be prudent, even if blood transfusion is carried out between people with the same ABO blood type, cross matching experiments should be carried out first, that is, not only the red blood cells of the donor and the serum of the recipient, but also the red blood cells of the recipient and the serum of the donor. Only when there is no agglutination reaction between the two blood types, blood matching can be carried out, and blood transfusion can be carried out.

3. Inheritance of RH-negative blood type: RH-negative blood, also called panda blood, refers to RH-negative blood type, a very rare blood type, which is called "panda blood" because it is extremely rare. Rh-negative blood is the common name of Rh-negative blood group. Human red blood cell blood group consists of more than 2 blood group systems. ABO and Rh blood groups are the two blood group systems most closely related to human blood transfusion. When there is a D blood group substance (antigen) on a person's red blood cells, it is called Rh positive, which is expressed by Rh(+); When D antigen is lacking, it is Rh negative, which is expressed by Rh(-). The distribution of Rh(-) varies greatly with different races, and the proportion of RH (-) in white people is high, about 15%.

RH negative blood can be divided into: RH negative type A; RH negative type b; RH negative o type; RH negative AB type