A grower wants to produce plants that all have large flowers.
The grower compared two methods of producing new plants over 6 months:
The Table shows the results.
Table
| Method | Number of plants produced | Percentage of plants with large flowers |
|---|---|---|
| seeds | 200 | 45 |
| tissue culture | 5000 | 100 |
Calculate how many times more plants with large flowers were produced by tissue culture than from seeds.
Explain why all the plants produced by tissue culture had large flowers but only some of the plants grown from seeds had large flowers.
Explain one disadvantage of growing only plants produced by tissue culture.
Tissue culture is also used in medical research.
Explain why using tissue culture is useful in medical research.
44 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.