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People can have different blood types, known as blood
groups. There are four main blood groups - A, B, AB and O. Each group can then
be either RhD positive or negative, so your blood group can be one of eight
types.
The genes you inherit from your mother and father determine
your blood group.
Click HERE for more information from the National Health
Service of the UK or view the video below:
Uploaded to youtube by ThePenguinProf
on Feb 25, 2011
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