Fone possesses one allele for blood group a antigen and one allele for blood group b, he will have type ab blood, distinctly different from both a and b. this type of inheritance is called

Codominance

Explanation:

According to the given information, an individual carries one allele for blood group A antigen and one allele for the blood group B. Let's assume that the allele I^A imparts blood type "A" while the allele I^B is responsible for blood type B. Now, the genotype of the individual is I^AI^B and its phenotype is blood type "AB".

When both the alleles of a gene are expressed in a heterozygote and the phenotype of the heterozygote is distinct from both the pure breeding parents, the pattern of inheritance is called codominance. The I^A and I^B alleles codominant as both are equally expressed in the heterozygote.

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