CBSE 2026 · Region 4 · Set 2 · Q4 · 1 mark
Which of the following amino acid substitutions is responsible for causing sickle cell anemia ?
Official answer
From CBSE’s own marking scheme for this paper.
(D)
Glutamic acid is substituted by valine in the $\displaystyle \beta$-globin chain at the sixth position.
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CBSE Class 12 Biology past-paper question from the 2026board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.