Human ABO blood type is an example of co-dominance, as well as a dominance hiera

Question

Human ABO blood type is an example of co-dominance, as well as a dominance hierarchy. The IA (blood type A) and IB (blood type B) alleles are co-dominant (produce blood type AB when together in the same individual, IA IB ), and both are dominant to the recessive i allele (only ii produces blood type O). Listed below are blood types for several children and their mothers. Give all possible genotypes and blood types for the father of each child.

Explanation / Answer

a) Father's blood type can be either B or O. Genotype - IBi or ii

b) Father's blood type can be either A, B or AB. Genotype - IAi, IBi or IAIB

c) Father's blood type can be either A, B, O or AB. Genotype - IAi, IBi, ii or IAIB

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