Doctors are testing a gene treatment for an inherited disorder. The treatment adds a working gene to some of a person's cells.
Two groups of 100 people with similar severity of the disorder received either the current treatment or the gene treatment. The results after one year are shown in the table.
| Treatment | Number of people whose symptoms improved | Number of people who had serious unwanted effects | Mean cost per person |
|---|---|---|---|
| Current treatment | 54 | 5 | £8,000 |
| Gene treatment | 79 | 12 | £30,000 |
Explain how adding the working gene could improve the symptoms of the inherited disorder.
Evaluate whether the gene treatment should be used instead of the current treatment. Use information from the table.
80 exam-style questions on AQA GCSE Biology 6.2 Variation and evolution, covering 6.2.1 Variation, 6.2.2 Evolution, 6.2.3 Selective breeding, 6.2.4 Genetic engineering, and 6.2.5 Cloning. Each one has a worked solution and a mark scheme showing where the marks go.