CBSE 2025 · Region 6 · Set 3 · Q6 · 1 mark
A normal couple produces half the sons as haemophilic and half the daughters as carriers. Choose the option that correctly indicates the chromosome on which the gene for this trait is located.
Official answer
From CBSE’s own marking scheme for this paper.
(C)
One X-chromosome of mother
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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.