A researcher records the coat patterns of a group of laboratory mice. All the mice belong to the same species. Some of the mice have plain coats, some have spotted coats and some have striped coats.
Which conclusion about the mice is correct?
The mice show no variation because they all belong to the same species.
The mice show variation only if each mouse's coat pattern changes as it grows.
The mice show variation because individuals of one species differ in coat pattern.
The mice must belong to several species because their coat patterns differ.
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.