Question

Which of the four couples claiming the baby with O+ blood type are possible the biological presents of it?
A. AB - and A +
B. A + and O -
C. O + and AB +
D. B - and 0 -

Answer 1

Hint: The membrane of red blood cells causes several antigens. Depending on the nature of antigens present on the membrane of RBCs various types of blood group grouping has been done to such groupings -the ABO and Rh-factor are widely used.

Complete Answer:
- ABO grouping depends on the presence or absence of two surface antigens in the RBCs namely A and B. The plasma of different individuals also contain two natural antibodies called anti-A and anti-B.
- ABO blood groups are controlled by gene I. The plasma membrane of the red blood cells has a sugar polymer that protrudes from its surface and the kind of sugar is controlled by the gene.

Now, let us find the correct answer.
 Using the table given below, we can find the correct answer.

If the one parent blood group is A and another blood group is O then the baby's blood type will be A, O. Hence, there is a possibility of O+ blood type.

Therefore, the correct answer is option B.

Note: Aside from the ABO blood grouping system, blood groups are additionally defined by the presence of the “Rh factor” on the membrane of RBCs. If the Rh factor is present, then the positive (+) sign is assigned to the ABO blood groups and in its absence the negative (-) sign is assigned.