Question

When one of the parents has ‘A’ blood group and the other parent has ‘O’ blood group, then their child can have _______ blood group.

• A. Only ‘A’
• B. Only ‘O’
• C. Both ‘A’ and ‘O’
• D. Either ‘A’ or ‘O’

Answer 1

The Correct Option is D

To ascertain a child's potential blood groups when one parent has blood group ‘A’ and the other has blood group ‘O’, the genetics of blood groups must be examined. Blood type is governed by alleles inherited from parents. Blood group ‘A’ may possess genotype AA or AO, whereas blood group ‘O’ can only be OO.

The possible scenarios are as follows:

• When the parent with blood group ‘A’ has genotype AA, potential combinations with an ‘O’ type parent (genotype OO) result in AO (blood type ‘A’).
• When the parent with blood group ‘A’ has genotype AO, potential combinations yield either AO (blood type ‘A’) or OO (blood type ‘O’).

Consequently, the child may inherit either blood group ‘A’ or ‘O’, contingent upon the genetic pairing. The definitive conclusion is:

‘A’ or ‘O’