Scientists followed four groups of adults for 10 years. Each group contained 500 adults, none of whom had type 2 diabetes at the start of the study.
| Group | Inherited allele affecting metabolism | Physical activity | Number who developed type 2 diabetes |
|---|---|---|---|
| A | absent | regular | 20 |
| B | absent | low | 45 |
| C | present | regular | 55 |
| D | present | low | 120 |
Explain the pattern in the results and why the results do not prove that low physical activity causes type 2 diabetes.
102 exam-style questions on Edexcel GCSE Biology 5.4 Non-communicable diseases, covering 5.4.1 Interaction of factors in non-communicable disease, 5.4.2 Lifestyle factors and non-communicable disease, and 5.4.3 Treatments for cardiovascular disease. Each one has a worked solution and a mark scheme showing where the marks go.