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en.wikipedia.org/wiki/Blood_type

A blood type (also called a blood group) is a classification of blood, based on the presence and absence of antibodies and inherited antigenic substances on the surface of red blood cells (RBCs). These antigens may be proteins, carbohydrates, glycoproteins, or glycolipids, depending on the blood group system.Some of these antigens are also present on the surface of other types of cells of ...

www.disabled-world.com/calculators-charts/blood-chart.php

Blood Types (Groups) A blood type (also called a blood group) is defined as the classification of blood based on the presence or absence of inherited antigenic substances on the surface of red blood cells (RBCs). A series of related blood types constitutes a blood group system, such as the Rh or ABO system.

www.medicalnewstoday.com/articles/218285.php

The best-known way of grouping of blood types is the ABO system, although there are other groups. Within the ABO group, four major categories are divided into eight common blood types: A, B, O ...

www.scienceabc.com/humans/humans-different-blood-types.html

Humans have another type of marker that characterizes their blood type in even greater detail. The Rh or the ‘Rhesus’ factor is a group of more than 40 antigens that also cover the surface of an RBC.

readanddigest.com/know-your-blood-type-different-types-of-blood-groups

These combined with the ABO system of blood grouping may fall one among the eight blood group Types known as A+, A-, B+, B-, AB+, AB-, O+, or O-. Genetic Inheritance of Blood Types Similar to the characteristic traits that an individual inherits from his parents, so also is the blood Type, which has a genetic inheritance.

www.quora.com/What-are-the-different-human-blood-groups-and-types

There are four main blood groups (types of blood): A, B, AB and O. Your blood group is determined by the genes you inherit from your parents. Each group can be either RhD positive or RhD negative, which means your blood group can be one of the eight types. Red blood cells sometimes have another antigen, a protein known as the RhD antigen.

www2.palomar.edu/anthro/blood/ABO_system.htm

In 1930, he belatedly received the Nobel Prize for his discovery of blood types. All humans and many other primates can be typed for the ABO blood group. There are four principal types: A, B, AB, and O. There are two antigens and two antibodies that are mostly responsible for the ABO types.

www.smithsonianmag.com/science-nature/the-mystery-of-human-blood-types-86993838

The Mystery of Human Blood Types The ABO blood group evolved at least 20 million years ago, but scientists still don’t understand the purpose of blood types ... And in some cases, like the MN ...

www.britannica.com/science/ABO-blood-group-system

ABO blood group system, the classification of human blood based on the inherited properties of red blood cells (erythrocytes) as determined by the presence or absence of the antigens A and B, which are carried on the surface of the red cells. Persons may thus have type A, type B, type O, or type AB blood. The A, B, and O blood groups were first identified by Austrian immunologist Karl ...

www.redcrossblood.org/donate-blood/blood-types.html?icid=rdrt-blood-types&imed=...

There are four major blood groups determined by the presence or absence of two antigens – A and B – on the surface of red blood cells. In addition to the A and B antigens, there is a protein called the Rh factor, which can be either present (+) or absent (–), creating the 8 most common blood types (A+, A-, B+, B-, O+, O-, AB+, AB-).