How is positive and negative blood type determined?
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The ABO blood system labels blood types with the letters A, B, AB, and O. Your blood also has a Rhesus or Rh factor, which can be either negative or positive. You inherit your blood type and Rh factor from your parents. To determine your Rh factor, find out your parents' Rh factors for information.
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Everyone has an ABO blood type (A, B, AB, or O) and an Rh factor (positive or negative). Just like eye or hair color, our blood type is inherited from our parents. Each biological parent donates one of two ABO genes to their child. The A and B genes are dominant and the O gene is recessive.
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