A researcher studies many random mutations in bread mould. Each mutation is studied separately by comparing the phenotype of bread mould with the mutation against bread mould without the mutation.
Which statement describes the likely pattern in the results?
A minority of the mutations will be associated with a changed phenotype.
None of the mutations will be associated with a changed phenotype.
A majority of the mutations will be associated with a changed phenotype.
About half of the mutations will be associated with a changed 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.