What is blood group inheritance?
Blood type is a classification based on the difference in human erythrocyte surface homologous antigens. Because of the difference in agglutination of human red blood cells, blood is divided into several types, so it is called blood type.
According to the current domestic and international clinical tests, more than 30 kinds of human blood types have been found. Each blood type system of human beings is determined by genetic factors and has immunological properties. The most common and common blood type system is ABO blood type, which is divided into four types: A, B, AB, and O; followed by Rh blood type system, which is mainly divided into Rh positive and Rh negative; again is MN and MNSs blood type system, but this blood type Very few people.
The human blood type is hereditary, and when the blood type genes of both parents are combined with the amphiphilic cells, they can be paired in the nuclear chromosomes, and the blood type genetic characteristics can be transmitted to the offspring.
Different blood types have different genetics:
The genetics of type A blood may be amphoteric A and A combined with AA, or it may be that the one A gene combines with another O to form AO, but the blood type expressed by AA or AO is A. Type, and O is a stealth genetic gene that cannot be expressed.
The genetics of type B blood is similar to that of type A blood, some are BB, some are BO, but all are expressed as type B.
Both AB and O blood genetic genes are consistent with the blood type exhibited, AB is AB and O is OO.
It can be seen that if the father or mother is A or B type blood, the child may be type A or type B, but it may also be type O, because type A or type B contain recessive genetic gene O, when the father inherits When O in the gene is combined with O in the parental gene to form OO, it is expressed as O.
Blood type genetic rule
Taking the common blood type ABO type as an example, the blood type is determined by a combination of three genetic factors such as A, B, and O. Most of the blood types of the baby can be judged according to the blood type of the parent. The genetic pattern of blood type is as follows:
What is the blood type of o-type blood and b-type blood-born children?
The genetic pattern of blood type : 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.
According to the blood type inheritance rule, if one of the parents has a blood type of O type and the other type is B type, the possible blood types of the two combined progeny are B type or O type, and it is impossible to be type A or type AB.
How do blood type babies and blood type mothers face different blood type babies?
Rh blood type genetic law
Rh (D) blood type is only positive and negative (positive, negative), and its inheritance is also true.
Rh(D) blood group genetic law:
Parent Rh (D) blood type: positive + positive child Rh (D) blood type: positive / negative
Parent Rh (D) blood type: positive + negative child Rh (D) blood type: positive / negative
Parent Rh (D) blood type: negative + negative child Rh (D) blood type: negative
Note: There are some rare exceptions, such as lesions, genetic mutations, etc., which can lead to inconsistency between children and their parents. The only accurate way to detect paternity is to perform DNA analysis and directly check whether the genetic material itself is inherited by Mendel. Genetic law.