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

If one parent has blood group ‘A’ (genotype AO) and the other parent has blood group ‘O’ (genotype OO), their offspring could inherit either the ‘A’ allele from the ‘A’ parent or the ‘O’ allele from the ‘O’ parent, leading to possible blood groups of ‘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.