Answer:
Dominant alleles: I^A and I^B
Two Dominant allele genotype: I^AI^A, I^BI^B and I^AI^B
Recessive allele: "i"
Recessive allele genotype= "ii"
Explanation:
The ABO blood typing is regulated by three alleles: I^A, I^B and i. Here, alleles I^B and I^A are dominant over the allele "i" while I^A and I^B exhibit codominance for each other. Since the allele "i" is recessive to the allele I^A, the genotypes "I^AI^A" and "I^A i" impart blood type A to the individual.
Similarly, the genotypes "I^BI^B" and "I^B i" impart the blood type B to the individual. The genotype "I^AI^B" gives blood type "AB". The allele “i” is expressed only in the homozygous state and the genotype "ii" makes the blood type "O".
