Based on observation on monohybrid crosses Mendel draw some conclusion. Which of the following is not correct-

Which is incorrect -

(i) ABO blood groups are controlled by the gene I
(ii) Gene I has four alleles
(iii) ${\mathrm{I}}^{\mathrm{A}}$ and ${\mathrm{I}}^{\mathrm{B}}$ produce same type of sugar
(iv) $\mathrm{i}$ or $\mathrm{I}°$ produce different type of sugar
(v) ${\mathrm{I}}^{\mathrm{A}}$ and ${\mathrm{I}}^{\mathrm{B}}$ are incomplete dominant