the gene (I) has three alleles: IA, IB, and i . Since humans are diploid, a person possesses any two of the three alleles . The allele 'i' does not produce any sugar . However, when IA and IB are present together, they both express their own types of sugars (not the same type) because of co-dominance . Therefore, the statement that they express the same type of sugar is incorrect.