(a)OR(i)

"It is sometimes observed that the $\displaystyle \mathrm{F}_{1}$ progeny shows a phenotype that resembles both the parents." Explain this type of inheritance using the example of A, B, O blood groups in human.

Type of Inheritance: Co-dominance Allele \(\displaystyle \mathrm{I}^{\mathrm{A}} \mathrm{i} / \mathrm{I}^{\mathrm{A}} \mathrm{I}^{\mathrm{A}}\) expresses, A type of sugar in A Blood group, whereas Allele \(\displaystyle \mathrm{I}^{\mathrm{B}} \mathrm{I}^{\mathrm{B}} / \mathrm{I}^{\mathrm{B}} \mathrm{i}\) expresses, B type of sugar in B Blood group, Gametes of A (Blood group) parent will have allele either \(\displaystyle \mathrm{I}^{\mathrm{A}}\) or i, and gametes of B (Blood group) parent will have allele either I \(\displaystyle { }^{\mathrm{B}}\) or i, Fusion of gametes containing allele \(\displaystyle \mathrm{I}^{\mathrm{A}}\) and \(\displaystyle \mathrm{I}^{\mathrm{B}}\) will result in \(\displaystyle \mathrm{F}_{1}\) progeny containing alleles \(\displaystyle \mathrm{I}^{\mathrm{A}} \mathrm{I}^{\mathrm{B}}\), expressing both type of sugars (antigen) in AB Blood group hence resembling both the parents.