Two groups are tested for a disease-associated DNA variant.
Table: Number of people in each group
| Group | Disease present | Disease absent |
|---|---|---|
| Variant present | 48 | 112 |
| Variant absent | 32 | 208 |
What percentage of all people with the disease have the variant?
12%12\%12%
30%30\%30%
60%60\%60%
80%80\%80%
40 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.