Researchers divided genetically identical aphids into two groups. Each group was raised for 10 days with a different amount of food available.
| Food availability | Mean body mass after 10 days in mg |
|---|---|
| low | 0.41 |
| high | 0.62 |
Use information from the table to explain why the mean body mass differed between the two groups.
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.