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Biology · 2025 · 3 marks
Biotechnology and its ApplicationsBiotechnological Applications in Medicine3 marksUnderstandshort answer
CBSE 2025 · Region 7 · Set 3 · Q22
Gene therapy can be used to treat an ADA deficient patient. Explain. Is it a permanent cure? How can ADA be cured permanently?
Gene therapy can be used to treat an ADA deficient patient. Explain. Is it a permanent cure? How can ADA be cured permanently?
Marking-scheme solution
• Lymphocytes from the blood of the patient are grown in a culture outside
the body, A functional ADA cDNA is then introduced into these lymphocytes, which are subsequently returned to the patients.
• It is not a permanent cure.
• If gene isolated from marrow cells producing ADA is introduced into
lymphocytes at early embryonic stage.
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CBSE Class 12 Biology past-paper question from the 2025 board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.