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There are 4 blood groups which are group a , group b , group ab and group o ....group o are also known as universal donors and group ab are also known as universal receivers.....
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pratik not all O groups only O+ and and AB+
yup...i know....i thought u all will understand.....

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Hi students!

- Karl Landsteiner discovered the different Blood Groups.
- Two types of chemicals found on the surface of red blood cells known as antigens.
- Blood group can be formed by alleles.
- Blood group A includes the allelic combination of AA or Ai.
- Blood group B includes the allelic combination of BB or Bi.
- Blood group AB includes the allelic combination of  AB.
- Blood group O includes the allelic combination of ii. 
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