CBSE 2025 · Region 4 · Set 1 · Q16 · 1 mark
Assertion (A) : ABO blood grouping in humans is an example of multiple allelism.
Reason (R) : More than two genes in a population govern the same character in ABO blood grouping in humans.
Official answer
From CBSE’s own marking scheme for this paper.
(C)
Assertion (A) is true, but Reason (R) is false.
Principles of Inheritance and VariationInheritance of One GeneUnderstandassertion_reasoneasy
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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.