Which is the fewest blood type in the world?

Blood group is a classic example of antigen-antibody specificity. There are more than 100 blood types of red blood cells, and the ABO blood group we are most familiar with is just one of them. The proportion varies according to ethnicity, with the highest proportion of O-type accounting for about 44%, type A about 27%, type B about 23%, and type AB about 6%.

Blood type refers to the antigenic molecules that are present on the surface of blood cells. People with type A have a antigen and people with type B have a B antigen; At the same time, people who have both are AB type, while people who have neither are O, which means zero. According to the principle that the same pair of antigens and antibodies cannot exist at the same time, people with type A have no A antibodies in their plasma but have B antibodies, while people with type O have A antibodies and B antibodies in their plasma, and so on.

This characteristic is the principle of blood group testing, and it is also a consideration for blood group selection during blood transfusion. ABO blood type is determined by genetic inheritance, and each blood type (phenotype) has a pair of genes (genotype).

According to Hastelloy Medical Biochemistry, there is a section of **blood group in it. The ABO blood type, the most common blood type in humans, is actually a problem of antigen carrying, and blood clotting will occur when the wrong blood is transfused, resulting in death. People with type AB can receive other types of blood, but only blood transfusions can be given to people with type AB; People with type A or B can receive blood of the same type or type O; People with type O can only receive type O blood.

The inheritance of blood group is controlled by a pair of genes, which have three types, namely A and B, which are dominant to each other, and type O, which is recessive. If an individual's blood group genes are A and B, they are AB people; A person with a genotype of AA or AO is a person with type A; Type B people have either BB or BO; People with type O carry two recessive O genes. If you look at the proportion of the population by blood type, it should be ab:

a:b:o is 2:

However, the distribution of blood types in the population is that people with type O are the most abundant, and people with type AB are the least.

That's right, AB is the least of the blood types. In addition, if there is no D antigen on red blood cells, it is commonly known as Rh-negative blood type. Otherwise, it is positive blood.

Therefore, the Rh-negative AB blood type is very rare. 1% of Oriental people are rh-negative and bloody; In the West, it is 15%.

AB is the least common AB blood group.

Least negative of the rh blood group.

Generally, our more common blood types are blood type A, blood type B, blood type AB and blood type O. Do you know rare blood types?