Genetic Considerations

Blood types are heritable. A person with blood type A must have inherited one or two copies of the A allele. The resulting genotype would be either AA or AO. Someone who is blood type B inherited one or two copies of the B allele and could have a genotype of either BB or BO. A person with blood type AB must have both the A and the B alleles, resulting in the AB genotype, and the genotype of a person who is type O must be OO. Each parent donates one of their two ABO alleles to each child. The Rh factor allele is inherited independently. An Rh+ person has one or two Rh+ alleles with a genotype of Rh+/Rh+ or Rh+/Rh-. An Rh- person has a genotype of Rh-/Rh-.

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