Your blood group or blood type is classified according to different antigens (proteins) that are present on the surface of your red blood cells. Blood group O+ has, no A or B antigens present on the red cell surface, but Rhesus factor is present. Blood groups are inherited from both your parents; this does not mean that your blood group is identical to your parents or your siblings. Often a pregnant mother may carry a foetus with a different blood group to her own. If both your mother and father are blood group O, then you and your siblings will only be blood group O.
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