A child of blood group 'O' cannot have parents of blood groups:

Options

A. AB and AB/O
B. A and B
C. B and B
D. O and O

Answer

A

Explanation

Blood group of the child is determined by allelic genes, i.e. `I^(A)I^(B)` and `I^(O)` in which `I^(A)` and `I^(B)` are dominant over `I^(O)`, so if one of the parent either mother or father is of blood group AB, then she or he will have both genes, i.e. `I^(A)` and `I^(B)` and child of such parent cannot have blood group O.