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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.

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-).

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.livescience.com/36559-common-blood-type-donation.html

In general, the rarest blood type is AB-negative and the most common is O-positive. Here's a breakdown of the most rare and common blood types by ethnicity, according to the American Red Cross. A ...

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 eig...

www.nhs.uk/conditions/Blood-groups

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 in total there are eight main blood groups. Blood is made up of red blood cells, white ...

www.webmd.com/a-to-z-guides/blood-types-what-to-know

While everyone’s blood is made up of the same basic parts, there’s actually a lot of variety in the kinds of blood that exist. There are eight different blood types, and the type you have is ...

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.

patient.info/treatment-medication/blood-tests/blood-groups-and-types

Blood group names. Your blood group depends on which antigens occur on the surface of your red blood cells. Your genetic make-up, which you inherit from your parents, determines which antigens are present on your red blood cells. Your blood group is said to be: A+ (A positive) if you have A and rhesus antigens.

www.britannica.com/science/blood-group

Blood group: Blood group, classification of blood based on inherited differences in antigens on the surfaces of the red blood cells. The most well-known classification, the ABO blood group system, was developed by Austrian-born American biologist Karl Landsteiner in 1901. Learn more about blood groups in this article.