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The four major blood types present in the human population include group A, group B, group AB and group O, according to the Red Cross. These blood type groups are based on blood an...

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Blood Types Chart | Blood Group Information | American Red Cross


In fact, there are eight different common blood types. ... There are four major blood groups determined by the presence or absence of two antigens – A and B  ...

Blood Types - KidsHealth


So medical experts group blood into types based on the different markers. The four main blood groups are: Type A. This blood type has a marker known as "A." ...

Blood Types - Infoplease


Blood Types. Human blood is grouped into four types: A, B, AB, and O. Each letter refers to a kind of antigen, or protein, on the surface of red blood cells.

Blood Type Chart: Facts & Information on Blood Group Types ...


Sep 28, 2012 ... Information regarding blood types including charts outlining donor ... Your body carries around four to six liters (7 to 10.5 pints) of blood.

Blood groups - NHS Choices


There are four different blood types, known as blood groups. The four main blood groups are A, B, AB and O.

What's the Most Common Blood Type? | Blood Type Percentages


Jul 13, 2012 ... The most common blood type among people in the U.S. is type O-positive.

Universal blood donor type: Is there such a thing? - Mayo Clinic


However, we now know even type O negative blood may have antibodies that cause serious reactions during a transfusion. There are four types of blood.

Human Blood: ABO 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 ...

Popular Q&A
Q: What are the four blood types?
A: The four blood types are A, B, AB, or O. Your blood type depends on which proteins are on the surface... Read More »
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Q: What are the four blood types?
A: Hayden is right. I wanted to correct what Ryanna said. Any blood type can be positive or negative and negative is less common. However, people with A blood can ... Read More »
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Q: What are the genotypes for the four blood types.
A: It would be IAIA or IAi for A blood type, IBIB or IBi for B blood type, IAIB for AB blood type, ii for O blood type. Read More »
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Q: What are the four blood types determined by?
A: The differences in human blood are due to the presence or absence of Read More »
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Q: What are the four blood type possible in humans?
A: O, A, B, and AB. Each can be Rh positive or negative. Read More »
Source: wiki.answers.com