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 determine the possible blood groups of a child when one parent has blood group ‘A’ and the other has blood group ‘O’, we must consider the genetics of blood groups. Blood type is determined by the alleles inherited from the parents. Blood group ‘A’ can be either genotype AA or AO, while blood group ‘O’ can only be OO.

Here's a breakdown of the possible scenarios: 

• If the parent with blood group ‘A’ has genotype AA, the potential combinations with an ‘O’ type parent (genotype OO) could be AO (blood type ‘A’).
• If the parent with blood group ‘A’ has genotype AO, the potential combinations are either AO (blood type ‘A’) or OO (blood type ‘O’).

Therefore, the child can potentially inherit either blood group ‘A’ or ‘O’, depending on the genetic combination. Hence, the correct answer is:

Either ‘A’ or ‘O’

Answer 2

• Blood group is determined by alleles inherited from both parents.
• The 'A' blood group has the genotype AA or AO, and the 'O' blood group has the genotype OO.
• If one parent has blood group 'A' (genotype AA or AO) and the other has blood group 'O' (genotype OO), the child can inherit the A allele from the 'A' parent and the O allele from the 'O' parent, giving a blood group of A (genotype AO).
• Alternatively, the child can inherit the O allele from both parents, resulting in a blood group of O (genotype OO).

Thus, the child can have either A or O blood group, making (4) Either 'A' or 'O' the correct answer.