CBSE 2025 · Region 4 · Set 1 · Q4 · 1 mark
In the given pedigree chart, a cross between a normal couple resulted in a son who was haemophilic and a normal daughter. In course of time, when the daughter was married to a normal man, to their surprise the grandson was also haemophilic.
Choose the option that indicates the correct inheritance of trait in the above pedigree chart :
Official answer
From CBSE’s own marking scheme for this paper.
(D)
Sex-linked recessive trait
Principles of Inheritance and VariationSex DeterminationAnalysemcqmedium
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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.