What is the most common blood type in humans?

1. Blood type A.

Blood type A is one of the common blood types and refers to the presence of A antigen in the blood. A blood group that belongs to the ABO blood group system. Type A is further divided into two subtypes: A1 and A2.

Type A1 red blood cells have A and A1 antigens on them, and anti-B antibodies in serum. Type A2 red blood cells have type A antigen on them, and anti-B and anti-A1 antibodies in serum.

2. Blood type O.

Blood type O refers to the blood type on the surface of red blood cells, which does not contain either A antigen or B antigen, and is commonly known as "universal blood transfusion". However, because the plasma contains anti-A antibodies and anti-B antibodies, it may cause different degrees of red blood cell hemolysis in the recipient.

3. Blood type B.

Blood type B is one of the common blood types, and famous people with blood type B include Deng Jiajia, Yin Tao, Fan Ming, Li Xiang, Chen Jiabao, Pu Cunxin, Liu Wei, etc.

When donating blood, check that I am type A.

There are many types of human blood types, and each blood group system is determined by genetic factors and has immunological properties. The most common blood group system is ABO blood group, which is divided into four types: A, B, AB, and O. followed by the Rh blood group system, which is mainly divided into Rh-positive and Rh-negative; The second is the MN and MNSS blood group systems. According to the current clinical testing at home and abroad, more than 30 human blood types have been found.

Blood type is a genetic trait that manifests itself in the form of blood antigens. There are many types of human blood types, and the most common blood types are A, B, AB, and O. abo

The locus of the blood group system is on chromosome 9. Human.

ABO blood group is controlled by: ab

o Three genes, but only two on chromosome 9 within each human cell.

ABO system genes, i.e. aoaa

bobbaboo

A pair of alleles in which. a and.

The B gene is the dominant gene, O

Genes are recessive.

The red blood cell blood group was discovered in 1900 by K Landsteiner in Austria. At present, there are four main blood types of red blood cells such as A, B, O and AB, and scientists such as Landsteiner did animal experiments in 1940, and found that rhesus monkeys and most human red blood cells have antigenic substances of Rh blood group, and all human blood red blood cells have Rh antigen (also known as D antigen), which is called Rh negative. In this way, the four blood types are divided into two types: Rh-positive and negative.

We have 4 blood types – O, A, B and AB.

Blood type O has the longest history. It appeared around 60,000 to 40,000 B.C., when Neanderthals ate a simple diet: weeds, insects, and predators that fell from trees ate the leftover fruit.

And 40,000 years ago, the Cromanon people appeared, and they lived by hunting. After hunting all the big beasts, they moved from Africa to Europe and Asia.

Blood type A appeared between 10,000 and 10,000 BC. At that time, our fruit-based ancestors gradually became omnivorous. Over time, farming became the main mode of production for the people living in present-day Europe, wild birds and beasts began to be domesticated, and the diet of people changed.

Even now, the vast majority of people with blood type A live in Western Europe and Japan.

Blood type B appeared between about 10,000 BC and the New Era. At that time, parts of East Africa were forced to migrate from the savanna steppes to the cold and barren Himalayas. Climate change is a major factor in the development of blood type B.

This blood type first appeared in the race, and as they continued to migrate to the European continent, many Eastern Europeans today share this blood type.

At present, the most commonly used blood group classification is ABO blood group and RH blood group. The ABO blood group classification refers to the blood group of red blood cells and is determined based on the antigen specificity on the surface of red blood cells. The main thing is to divide human blood groups into four types: A, B, AB, and O.

The RH blood group is divided into negative and positive. These two are closely related to blood transfusion and pregnancy. Blood type is determined by genetics, and the blood type relationship between parents and offspring depends on genetic factors.

If both parents are O-type, the parent is also O-type, and the parent is O-type or AB-type, then the offspring is A-type or B-type.