Type of genetic inheritance that determines abo blood group, Biology

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What is the type of genetic inheritance that determines the ABO blood group system? What are the relations of dominance among the involved alleles?

The inheritance of the ABO blood system is a multiple alleles inheritance. There are three occupied alleles, IA, IB and i that combine in the pairs to form the genotypes.

Concerning the dominance, the allele i is recessive in relation to the alleles IA and IB between IA and IB however lack of dominance is established with the heterozygous (IAIB) manifesting distinct phenotype.

 


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