Showing posts with label blood type history human migrations. Show all posts
Showing posts with label blood type history human migrations. Show all posts

Wednesday, June 10, 2020

Blood Type History

Blood types are determined by the presence or absence of certain antigens substances that can trigger an immune response if they are foreign to the body. Well almost everywhere since some countries beg for blood donors of certain types.

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These antigens may be proteins carbohydrates glycoproteins or glycolipids depending on the blood group system.

Blood type history. The a blood group is common in central europe. The 8 main blood types belonging to the abo and rhesus systems are seen everywhere around the world. In montana 80 of the blackfoot tribe has the a blood group.

This blood type is also found in high levels among small unrelated groups of people. The oldest group is either group a or one of the forms of group o. Several of these red blood cell surface antigens can stem from one allele and collectively form a blood group system.

The abo blood group as the blood types are collectively known are ancient. The other blood groups are tens of thousands of years old with b being more recent than a. Some of these antigens are also present on the surface of other types of cells of various tissues.

What they agree on is that ab is the most recent and didn t occur until the 16th century when group a populations from europe and group b populations from asia began to mix. Blood group b is a distinctly non indo european blood type. Before the discovery of blood typing doctors did not perform any screening tests before a transfusion.

One among the group of non indo european peoples known as the finno ugrics such as the hungarians and the finns the other among the central slavic peoples czechs southern poles and northern serbs. Nearly half the population in denmark norway austria and the ukraine have this blood type. In europe only two areas with a high rate of blood group b appear.

Contrary to what you may expect the distribution differs in every corner of the globe according to many ethnic and racial analyses done throughout. Some early blood transfusion devices were nothing more than a tube system to transport blood from the donor directly into the veins of the recipient. Central and eastern europe.

A blood type is a classification of blood based on the presence and absence of antibodies and inherited antigenic substances on the surface of red blood cells. Since some antigens can trigger a patient s immune system to attack the transfused blood safe blood transfusions depend on careful blood typing and cross matching. The first blood transfusion in recorded history took place in 1665.

Humans and all other apes share this trait inheriting these blood types from a common ancestor at least 20 million.