Parents of blood groups O and AB cannot have | vedclass

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(D) The genotype of a person with blood group $O$ is $ii$ (recessive).The genotype of a person with blood group $AB$ is $I^A I^B$ (codominant).When th

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Gene $A$ and $B$ are absent in one of the parents

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(D) The genotype of a person with blood group $O$ is $ii$ (recessive).The genotype of a person with blood group $AB$ is $I^A I^B$ (codominant).When these parents cross,the possible offspring genotypes are $I^A i$ (blood group $A$) and $I^B i$ (blood group $B$).Since the $O$ parent lacks both $I^A$ and $I^B$ alleles,they cannot pass these alleles to the offspring.Therefore,it is impossible for the child to have the $AB$ blood group,as the child must inherit one allele from each parent.

Parents of blood groups $O$ and $AB$ cannot have a child of group $AB$ because

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