Since blood group A and B both are dominant alleles, the father of the child would not have blood group B.
Blood grouping refers to the the classification of individuals based on the nature of the antigenic protein on the surafce of their red blood cells.
The four types of blood groups are, A, B, C and D.
Blood group A has antigen A on the surface of the red blood cells.
A woman A woman with type A blood that has a child with type A blood has a husband who is either blood group A or AB.
Therefore, because blood group A and B both are dominant alleles, the father of the child would not have blood group B.
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