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Melanie has a type B blood her husband Robert has Type A B blood is it...

Melanie has a type B blood her husband Robert has Type A B blood is it possible for Robert and Melanie to have a child with type O blood explain

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No it is not possible to have a child of O blood group to a couple of B and AB respectively. It is because in ABO blood group A and B genes are dominant and is expressed on RBC and O is recessive. So when both A and B are present then both are expressed and said to be codominant.The genotypes of the parents and the offspring is as follows

IBIB/IBIo X IAIB    Parents

IB/IB Io IA IB Gametes

IBIB IBIA IoIA IoIB Offsprings

IBIBB blood group B

IAIB blood group AB
IoIA blood group A

IoIo this genotype is the only possibility to have a O blood group.

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