Possible Blood Type Outcomes

Blood types are controlled by multiple alleles. There are actually three different alleles; A, B, and O that determine a person’s blood type. (Although there are three alleles possible, remember that each person only has two genes for every trait.)

Of the three alleles, A and B show codominance. This means that a person possessing both A and B alleles as their genotype, has AB blood because both alleles are expressed in the phenotype. The O allele however, is recessive to both the A and B allele. Therefore, a person possessing both A and O alleles will have a blood type of A. Likewise, a person with both B and O alleles will be blood type B because B is dominant, and therefore, masks the O allele.

7 thoughts on “Possible Blood Type Outcomes

  1. hi just curious my mother o rh neg partners mother o rh neg partner abo- me o rh neg my grandmother likly o rh neg as she had several still bornes my children will be what

  2. Some one asked me: “What type of blood with my child be if I am O Rh- and my partner is AB Rh-?”

    The answer is, the only outcome for your childs’ type could be: Blood Type A Rh- or B Rh-. If you are O and your partner is Ab, you will NOT have an AB or O child. This is just how the genetic variations work with those two types.

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