A scientist separated four cells from one early sheep embryo. Each cell developed into an embryo and was placed into a different host mother.
After the lambs were born, all conditions were kept the same except for their daily food supply. No mutations occurred.
| Lamb | Daily food supply in kg | Increase in mass over 8 weeks in kg |
|---|---|---|
| A | 0.6 | 8.2 |
| B | 0.8 | 10.5 |
| C | 1.0 | 12.9 |
| D | 1.2 | 15.0 |
Calculate how much greater the increase in mass was for lamb D than for lamb A.
Using the method and the data, explain how the lambs could show variation in their increase in mass even though no mutations occurred.
A fifth cell from the same early embryo develops into lamb E. Lamb E receives 0.9 kg of food each day.
Suggest a likely increase in mass for lamb E over 8 weeks. Explain your answer.
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.