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Genetics of Blood Types

Genetics of Blood Types. Genotypes and Phenotypes. Type A, Type B , Type AB and Type O blood are phenotypes . It is not always possible to tell the genotype of a person from their blood type. For example, a person with type A blood could have the genotype AA or AO

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Genetics of Blood Types

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  1. Genetics of Blood Types

  2. Genotypes and Phenotypes • Type A, Type B , Type AB and Type O blood are phenotypes. It is not always possible to tell the genotype of a person from their blood type. • For example, a person with type A blood could have the genotype AA or AO • A person with type B blood could have the genotype BB or BO

  3. If a person has type AB blood they must have inherited an A allele from one parent and a B allele from the other. • A person with type O blood must have the genotype of OO since the O allele is recessive to both the A allele and the B allele.

  4. Rh factor • Rh factor is inherited independently from the ABO blood factors. • There are two alleles: Rh + and Rh- • A person that is Rh+ might be Rh+/Rh+ or they might be Rh+/Rh- • A person that is Rh- must be Rh-/Rh-

  5. . Suppose a father of blood type B and a mother of blood type O have a child of type O. What are the chances that their next child will be blood type O? Type B? Type A? Type AB? • Make a punnett square to show the possible outcomes.

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