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Everyone has either A, B, AB, or O type blood. A person’s type of blood also gets accompanied with an Rh factor of positive or negative. As with physical traits, parental genetics determines both blood type and Rh factor. Each parents donates one of two blood genes to the child. For example, if one parent donates an O gene, and the other donates an A gene, the A wins out to provide the child with A type blood. O type blood only becomes possible when both parents provide an O gene.
The Rh factor of blood is merely a protein located on the outer layer of red blood cells. Red blood cells that have this protein become positive, while those that lack it become negative. As with blood types themselves, a person inherits their Rh factor from the parents. When paired together, the positive gene dominates the negative.
