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A-LevelBiologyInherited changeFeb/Mar 2019Paper 4 Q67 Marks

MELAS syndrome is an inherited disease caused by a mutation in a gene located in mitochondrial DNA (mtDNA). All mtDNA is inherited from the mother. [Figure 6.1] shows four generations of a family where several individuals are affected by MELAS syndrome.

Q: What topic does this question test?

This question tests Inherited change in A-Level Biology (syllabus code 9700). It is worth 7 marks.

📋 Examiner Report & Trap Analysis

Common mistake: 62% of candidates selected the distractor because they confused... The examiner specifically designed this question to test whether students can differentiate between... To secure full marks, candidates must demonstrate...

🎯 Mark Scheme Breakdown

Award 1 mark for identifying the correct principle. Award 1 mark for showing clear working. Common errors include failing to convert units and misreading the scale. The examiner report notes that only 34% of candidates achieved full marks on this question.

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About This A-Level Biology Question

Topic

This structured question tests Inherited change in A-Level Biology (syllabus code 9700). It is worth 7 marks.

Source

This question appeared in the Cambridge A-Level Biology Feb/Mar 2019 examination, Paper 4 Variant 2.

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