Scientists produced two genetically modified lines of potato and grew them in the presence of a particular insect pest.
| Potato line | Bt gene detected | Bt protein concentration in leaf tissue (µg per g) | Mean leaf area damaged by the insect pest (%) | Mean mass of potatoes per plant (kg) |
|---|---|---|---|---|
| P | yes | 16.0 | 8 | 1.8 |
| Q | yes | 0.0 | 37 | 1.2 |
Using the information in the table, explain why potato line P has a higher yield than potato line Q, even though the Bt gene was detected in both lines.
100 exam-style questions on Edexcel GCSE Biology 4.3 Selective breeding and genetic modification, covering 4.3.1 Selective breeding and its impact, 4.3.2 Tissue culture, 4.3.3 Genetic engineering overview, 4.3.4 Main stages of genetic engineering, 4.3.5 Advantages and disadvantages of GM organisms, 4.3.6 Agricultural solutions for a growing population, and 4.3.7 Evaluating genetic engineering and breeding. Each one has a worked solution and a mark scheme showing where the marks go.