Parents of blood groups $O$ and $AB$ cannot have a child of group $AB$ because
Gene $O$ is dominant over gene $A$
Gene $O$ is dominant over gene $B$
Gene $A$ or $B$ is absent in one of the parents
Gene $A$ and $B$ are absent in one of the parents
If one parent has blood group $A$ and the other parent has blood group $B$, the offsprings have which blood group
The father has blood group $AB$ and mother $‘O'$. The child is supposed to have which of the following bloodgroups
A child's blood group is ‘$O$'. The parents blood groups cannot be
If a child has $O$ type of blood group and the father $B$ type, the genotype of the father will be
Definitions / Explanation : Co-dominance