Q6. Identify the wrong statement with reference to the gene ‘I’ that controls ABO blood groups.

3. When IA and IB are present together, they express same type of sugar.

Solution:
ABO blood groups are controlled by the gene I.
The gene (I) has three alleles IA, IB and i. The alleles IA and IB produce a slightly different form of the sugar while allele i does not produce any sugar.