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2. ABO Genetics

Like eye or hair color, a child inherits their blood type depending on their parents’. As long as the parents do not have type AB blood, the child has the potential to have type O blood. This is in addition to whichever blood type the parents have. For example, if the parents have type A and type B blood, the child could have type O, type A, or type B. However, if one or both of the parents have type AB blood, the child can have any blood type except type O.

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