CBSE 2025 · Region 2 · Set 1 · Q3 · 1 mark
A child with blood group A has father with blood group B and the mother with blood group AB. Choose the option that gives the correct genotypes of father, mother and the child :
Official answer
From CBSE’s own marking scheme for this paper.
(C)
Father - $\displaystyle \mathrm{I}^{\mathrm{B}} \mathrm{i}$, Mother - $\displaystyle \mathrm{I}^{\mathrm{A}} \mathrm{I}^{\mathrm{B}}$, Child - $\displaystyle \mathrm{I}^{\mathrm{A}} \mathrm{i}$
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CBSE Class 12 Biology past-paper question from the 2025board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.