Scientists investigate whether an allele and low physical activity are associated with a disease.
| Allele present | Low physical activity | Number studied | Number with the disease |
|---|---|---|---|
| yes | yes | 500 | 80 |
| yes | no | 500 | 25 |
| no | yes | 500 | 45 |
| no | no | 500 | 10 |
Calculate the percentage of the people with the allele who had the disease.
Evaluate the conclusion that the allele causes the disease.
96 exam-style questions on Edexcel GCSE Biology 3.4 Variation and the Human Genome Project, covering 3.4.1 Causes of variation, 3.4.2 Outcomes of the Human Genome Project, 3.4.3 Genetic variation within a population, and 3.4.4 Effects of genetic mutations on phenotype. Each one has a worked solution and a mark scheme showing where the marks go.