Scientists investigate variation in adult body mass in mice of the same species. Mice with genotype P and mice with genotype Q are reared on either a low-energy diet or a high-energy diet. All other conditions are kept the same.
| Genotype | Diet | Mean adult body mass in g |
|---|---|---|
| P | low-energy | 22.4 |
| P | high-energy | 28.9 |
| Q | low-energy | 25.7 |
| Q | high-energy | 34.1 |
A scientist concludes that differences in adult body mass are caused only by diet.
Evaluate the scientist's conclusion. Use the data in your answer.
96 exam-style questions on Edexcel GCSE Biology 3.4 Variation and the Human Genome Project, covering 3.4.1 Causes of variation, 3.4.2 Outcomes of the Human Genome Project, 3.4.3 Genetic variation within a population, and 3.4.4 Effects of genetic mutations on phenotype. Each one has a worked solution and a mark scheme showing where the marks go.