In humans blood type A and B are equally dominant (codominant). Both types are dominant to type O. Aman with type AB blood marries a woman with type O blood, give the genotype and phenotype of all possible offsprings

The correct answer would be -

Genotype: IAIO or IBIO

Phenotype: A Blood or B Blood

Explanation:

Blood group A and blood group B both are dominant over the blood group O, however, both A and B are codominant if present together and form the blood group AB.

The blood group of Aman is AB and If he marries the female with O blood group then possible blood group in offspring would be as follows:

gametes: Aman = IA and IB

woman = IO IO

then cross between:

    IA     IB

IO IAIO IBIO

IO IAIO IBIO

the genotype of this cross would be 50% chances of IAIO and 50% chances of IBIO and phenotype would be either Type A or type B.

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