Researchers raise genetically identical young rabbits in two groups. One group receives a high-energy diet and the other receives a low-energy diet. All other conditions are kept the same. After eight weeks, the groups have different mean body masses.
Which conclusion is best supported?
Body mass is discontinuous because the groups had different mean body masses.
The difference in body mass was caused by inherited allele differences between the groups.
The diets changed the rabbits' alleles and produced the difference in body mass.
Environmental conditions contributed to the difference in body mass between the 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.