A breeder wants to produce pea plants that resist a fungal disease and have at least 85% of their pods ripening within the same three-day period.
The breeder crosses two varieties and grows four offspring plants under the same conditions.
| Offspring plant | Survived exposure to the fungal disease | Pods ripening within the same three-day period (%) |
|---|---|---|
| P | yes | 92 |
| Q | no | 95 |
| R | yes | 88 |
| S | yes | 61 |
Explain how the breeder should use these results to continue the selective breeding programme and predict how the pea population will change after many generations.
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.