Question

What cannot be father's blood group if the mother has blood group B
and child blood group is O?​

Answer 1

Answer:

AB

Explanation:

Blood Groups {B.G} are genetically controlled by 3 allele i.e. $i_a , i_b , i_o$

Here Child's B.G. is O i.e. $i_oi_o$

Mother B.G. is B i.e. $i_bi_o$

For child's B.G. to be O father's B.G. must be $I_aI_o$ or $I_bI_o$ or $I_oI_o$ i.e A OR B with an o allele. OR O B.G.  

So father's B.G. CAN BE A,B,O BUT NOT AB .

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