How is blood type determined What is a person s blood type determines what it is

It's genetically determined. The proteins on our blood cells are different, it is controlled by a pair of genes on the chromosome. The chromosomes that control blood group genes come from the father and the other from the mother.

For example, a pair of genes of the father and mother are AA, which is expressed by type A blood, and they pass on the A to their children respectively, so that the child's gene is AA, and the pair of genes AA is different from the parent's gene AA, so the protein on the child's blood cells is different from the parent's, and the expression is type O blood.

Blood type is a complex issue, and the blood type often referred to refers to the red blood cell blood group, the most important is the ABO blood group system, that is, the blood type of people is divided into four types: type A, B, AB and O. People with type A have a antigen on their red blood cells, type B has a B antigen, type AB has two antigens, A and B, and type O has no antigen. According to the genetic law of blood group, a fixed model in the table can be formed.

Because of mother and child"Blood type incompatibility"It can cause the mother to produce antibodies, and cause hemolysis of the fetus and newborns, resulting in jaundice, severe fetal edema, and even fetal death in utero. Some develop hemolytic jaundice after birth, known as neonatal hemolysis.

The genetic relationship of blood type between parents and children can provide some clues in the identification of parental authority in forensic medicine, and has certain reference value.

Genetic relationship of blood type between cousins and children.

Children with double new blood types may not have blood types.

a×aa，ob，ab

a×oa，ob，ab

a×ba，b，ab，o- -

a×aba，b，abo

b×bb，oa，ab

b×ob，oa，ab

b×aba，b，abo

ab×oa，bab，o

ab×aba，b，abo

o×ooa，b，ab

There are many ways to classify human blood types. The most commonly used of these is the RBOC ABO blood group system. If blood groups are classified according to the ABO blood group system, an individual's blood group is divided into four types of blood types A, B, AB, and O based on the blood group antigens on the red blood cell membrane.

Depending on your parents' genes, you first need to understand what the genes of each blood type are: type A - AI gene, type B - BI gene, AB type - AB gene, type O - II gene. This involves the question of genetic recombination, you can search for specific how the gene is recombined, and your question can be answered!

Your dad is xy and your mom is xx

Half of each of them is you.

There will be a total of 4 situations:

x+x=xx x+x=xx y+x=xy y+x=xy, if it's xx, you're going to be a mother.

If it's xy, you're going to be a dad.

In a word, blood type is determined by the parents.

It is determined by the chromosomes of the parents.

Please be clear. I don't know what your title means.

Blood is divided into 4 blood groups based on the presence of antigens A and B on the red blood cell membrane: A, AB, B, and O.

Blood type refers to the type of antigen on the surface of blood components, including red blood cells, white blood cells, platelets. The blood group usually refers to the specific antigen type on the red blood cell membrane, and it is most closely related to clinical practice, and people are familiar with the red blood cell ABO blood group system and the RH blood group system.

Only antigen A is type A on red blood cells, only antigen B is type B, and if there is both A and B antibodies, the principle is AB, and those without both antigens are type O. People with different blood types have different antibodies in their serum, but they do not contain antibodies against their own red blood cell antigens. Such as:

In blood type A serum contains only anti-B antibodies. Among the people of all ethnic groups in China, blood type A, B and O blood types account for about 30% each, and AB type only accounts for about 10%.