Question

A child with mother of ’A’ blood group and father of ’AB’ blood group will have blood group
A. O
B. A
C. A and O
D. O and B
E. A, AB or B

Answer 1

There are four main types of blood groups- A, B, AB and O having either Rh negative or positive which concludes 8 blood groups. The principle of blood grouping is primarily based on the agglutination reaction. People having O blood group are universal donors while people having AB blood group are universal recipients.

Complete answer:

| I(a)| I(b)
---|---|---
I(a)| A| AB
I(a)| A| AB
I(o)| A| B

Option A- O
The plasma of O blood group contains both the antibodies i.e. anti-A and anti-B but the surface of the RBC doesn’t contain A and B antigens.
Option B- A
The plasma of A blood group has anti-B antibody and the surface of the RBC contains A antigen.
Option C- A and O
Option D- O and B
The plasma of B blood group has anti-A antibody and the surface of the RBC contains B antigen.
Option E- A, AB or B
The plasma does not contain anti-A or anti-B antibodies while the surface of RBC contains both A and B antigens. So as you can see the cross in the above table, the possible blood groups their child can have is A, AB or B.

Thus, the correct option is option E- A, AB or B.

Note: The most common blood group is O i.e. 37% followed by B at 32% and then A at 22.8% and AB at 7% being the least prevalent blood group in India. Some red blood cells have Rh factor which is also known as RhD antigen. If the red blood cells contain the RhD antigen then they are RhD positive and vice-versa. Therefore, 94% of the donor population is Rh positive and remaining are Rh negative.