Rabbits from two groups, A and B, inherited different combinations of alleles. Rabbits from each group were raised on either a standard diet or a high-energy diet. The table shows the mean body mass of the rabbits at 16 weeks old.
| Inherited allele group | Diet | Mean body mass (kg) |
|---|---|---|
| A | Standard | 1.4 |
| A | High-energy | 1.8 |
| B | Standard | 1.6 |
| B | High-energy | 2.0 |
A student concludes that diet is the only cause of differences in body mass. Evaluate this conclusion using the data.
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.