Scientists have produced a group of genetically modified (GM) goats by inserting a gene from another organism. The goats produce a protein in their milk that was not previously present in the food supply. The milk passed tests before it was sold as food. The company recorded reports of unexpected allergic reactions among people who drank the milk.
| Period after the milk was first sold | Number of people who drank the milk | Number reporting an unexpected allergic reaction |
|---|---|---|
| Months 1–3 | 1200 | 2 |
| Months 10–12 | 2500 | 7 |
Calculate the percentage of people who reported an unexpected allergic reaction in each period. Use your calculations to compare the two periods and explain why the milk should continue to be monitored.
127 exam-style questions on OCR GCSE Biology 6.2 Feeding the human race, covering 6.2.1 Biological factors affecting food security, 6.2.2 Agricultural solutions to growing demand, 6.2.3 Selective breeding, 6.2.4 Genetic engineering, 6.2.5 Steps in genetic engineering, 6.2.6 Benefits and risks of gene technology in agriculture, and 6.2.7 Biotechnological solutions to growing demand. Each one has a worked solution and a mark scheme showing where the marks go.