Researchers rear two groups of rabbits belonging to the same species. DNA analysis shows that the groups have different inherited allele combinations. From birth, both groups receive the same type and amount of food and are kept under the same conditions. The mean adult body mass is 2.5 kg in one group and 3.1 kg in the other group.
Which conclusion is best supported?
The separation of the group means is enough to classify adult body mass as discontinuous variation.
Controlling the rearing conditions strengthens the evidence that inherited variation influenced the group means.
The difference between the group means provides evidence that environmental variation was greater than inherited variation.
The lower group mean shows that genetic variation within that group is smaller than in the other group.
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.