CAIE A Level Biology 9700 · Genetic technology

Genetic technology: outline question

Outline5 marksStandard

Severe combined immunodeficiency (SCID) is a genetic disorder caused by a defect in the gene coding for adenosine deaminase (ADA). Outline how gene therapy could be used to treat a patient with SCID by supplying a working copy of the ADA gene.

How this question is marked

5 marks, so the mark scheme is looking for about 5 separate creditworthy points. Making the same point twice in different words earns it once.

Outline means: Give the main points briefly. Less detail than describe, but every key step has to be there. One short line per step, in order. The marks are for coverage, not depth.

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