Question

A woman with ‘O blood group’ marries a man with ‘AB blood group’. Work out the cross to show all the possible phenotypes and genotypes of the progeny with respect to blood groups. Explain the pattern of inheritance observed in this cross.

Answer 1

Answer:

Women with O blood group = OO (sjnce O is recessive)

Men with AB blood group = AB (they show codominance)

Progeny

O O

A AO AO

B BO AO

The ratio of phenotypes and genotypes is same that is 1:1 and the progeny will have either A blood group or B blood group.

Hope it helps..

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Answer 2

A women with O blood group marries a man with AB blood group.

• Here the genotype of O blood group is ii and the genotype of AB blood group is IᵃIᵇ .

• When ii and IᵃIᵇ will be crossed then Two progeny with genotype Iᵃi and Two progeny with genotype Iᵇi will be seen.

• There for the blood group of two progeny will be A and of two progeny will be B .

• 1:1 will be seen.

• This pattern of inheritance observed in this cross is Co- dominance.