Question

If the blood groups of the parents are\[\;{O^{ + ve}}\]and\[\;{A^{ + ve}},\]the child with a normal genotype cannot show a blood group
A. \[A{.^{ + ve}}\]
B. \[A{B^{ + ve}}\]
C. ${O^{ + ve}}$
D. \[{A^{ + ve}}\]or${B^{ + ve}}$

Answer 1

Hint: Blood grouping a type of codominance in which both blood groups A and B are equally dominant over one another and hence show blood group AB.
These blood groups are determined by the presence of antigen on the membrane of RBC.

Complete answer: The blood group of a child whose parents have blood groups AB and O cannot be AB.
For the blood group, O genotype must be ii, and for AB it will be IA IB.
This will lead to the production of blood groups A and B having genotypes\[\;{I^A}i\] and \[{I^B}i\] respectively.
The presence of blood group O will also be observed as either antigen A or B may be present. Because the Rh factor present in both the parents is positive the progeny will also have a positive Rh value.

Additional information: Your blood type is a way to classify your blood according to what's in it: antigens, including the Rhesus, or Rh, factor.
Antigens are a form of protein on red blood cells.
Based on the type of antigen, your blood will be classified as Type A, Type B, Type AB, or Type O.

Hence, the correct answer is (B) $A{B^{ + ve}}$

Note: In the blood group O, no antigen that is A or B is present, and hence such a blood group is known as a universal donor because of the presence of no antigen, no antibody is formed by such individuals.