Which statement describes the effect of most mutations on phenotype?
They produce small changes in phenotype.
They produce beneficial changes in phenotype.
They produce large changes in phenotype.
They produce no change in phenotype.
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.