Why are there only 4 blood types?

Why are there only 4 blood types?

Blood Type and COVID-19: There May Be Something Here

Previous questionHow to accept yourself and start treating yourself well? What literature on this issue would you advise to read?
Next questionBy 2100, will the statement "Consciousness is an electrochemical process in the brain" become obsolete?

answers (3)

Answer 1
January, 2021

The blood plasma contains special proteins involved in immune reactions, agglutination (gluing of cells, microbial particles). And they are called agglutinins. There are only two types of them. They were conventionally named - alpha and beta. But they are found in everyone in different ways - someone has two types of proteins at once, someone has one of them, and someone has none. Erythrocytes contain agglutinogens - their function is to replace missing agglutinins. Conventionally - A and B. That is, if there is no alpha in the plasma, then there is A in the erythrocytes, if there is no beta in the plasma, there is B. If there is no alpha or beta in the plasma, there are A and B in the erythrocytes, if plasma has both alpha and beta - there are no agglutinogens in erythrocytes.

So we get blood groups:

* α and β: first (0)

* A and β: second (A)

* B and α: third (B)

* A and B: fourth (AB)

That is, in all In four groups, we essentially have two proteins we need.

Answer 2
January, 2021

Division into 4 groups is not some kind of fundamental law, it is a systematization adopted by a person, the purpose of which is to explain to whom what can be poured. I heard this version of why it happened in nature this way:

Previously, all people had one blood group (0), but then their diet began to change, people began to switch to growing plants, a second blood group appeared ( A), the third group (B) appeared with the repeated change of the diet - people began to engage in animal husbandry. The fourth group (AB - the latest), was formed during the incest of the second and third. At the same time, the child's blood group, knowing the group of parents, is almost impossible to predict with accuracy, but it is safe to say which group the child will not have.

Group 1 (00)

Group 2 (AA, A0)

Group 3 (BB, B0)

Group 4 (AB)

So when crossing, one character is taken from one parent and the second from another, for example AA + B0 = AB (A0 or B0), but not 00 (that is, the first group cannot be)

The story may not be the most true, since monkeys have the same blood groups like a human, but beautiful.

Answer 3
January, 2021

Because the blood type is determined by the presence or absence of two proteins (not counting the Rh factor). So we get 4 groups (conditionally 00, 01, 10, 11).

Related question

In the US, tablets are sold in jars instead of blisters, or are they only shown in films? And why is this type of packaging more common there?

Read more

Are all blood types equally tasty for mosquitoes?

Read more

Why do people have different blood types? What's the difference?

Read more

What are Blood Types?

How do I know my blood type?

Read more

Help me to understand. I only know four blood types. I heard about rare bands - CwCdee, ccDEE, CCDEe, ccddee, CcDEE, Ccddee, CCDEE, CCddEE. What is it?

Read more

How do different blood types differ?

Read more

What is the most demanded blood type for donation?

Read more

What foods lower blood sugar in type 2 diabetes?

Read more

Blood Types, Blood Group Systems and Transfusion Rule, Animation

How to combine functional training with strength training in the gym? If there are only 3-4 lessons per week. And can they be combined in one day?

Read more

how to understand whether a girl is a virgin, because for the first time not everyone has blood. what other options are there? only 100%?

Read more

Is there a possibility that a new human blood type will appear someday in the world, due to evolution or some kind of mutation?

Read more

Is it true that crazy people can change their blood type?

Read more

Why is there blood in the stool?

Read more

The World's Most Dangerous Blood Type

Why does only 5 liters of blood flow from the corpse, and 20 from the living?

Read more

What type of prosthetics or implantation can you choose if there are 3 teeth on the upper jaw and 4 on the lower? And what budget might you need?

Read more

Why is there a constant lack of donor blood?

Read more

Are there frozen caries? Why do dentists suggest only observing this, and not treating it?

Read more

Why do mosquitoes bite me but my friends are not there? Does this mean my blood is sweeter?

Read more

Why do blood types matter? - Natalie S. Hodge

Why are people afraid of blood?

Read more

I have 2+, my daughter has 3-. So what is your husband's blood type?

Read more