How blood groups are inherited ?

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How blood groups are inherited ?

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A person has one of the four blood groups : A, B, AB or O. This blood group system is controlled by a gene which has three different forms denoted by the symbols IA, IB and IO. The genes IA and IB show no dominance over each other, that is, they are co-dominant. However, genes IA and IB both are dominant over the gene IO. In other words, the blood gene IO is recessive in relation to genes IA and IB.

How do genes control the traits ?   Read Here

Blood Group

Although there are three gene forms (called alleles) for blood, but any one person can have only two of them. So, the blood group of a person depends on which two forms of the genes he possesses.

  • If the genotype (gene combination) is IA IA, then the blood group of the person is A. And if the genotype is IA IO even then the blood group is A (because IO is a recessive gene).
  • If the genotype is IB IB, then the blood group of the person is B. And if the genotype is IB IO even then the blood group is B (because IO is a recessive gene).
  • If the genotype is IAIB, then the blood group of the person is AB.
  • If the genotype is IOIO, then the blood group of the person is O.

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