Genetically identical young plants are divided into two groups. One group receives a mineral solution and the other receives water without minerals. All other conditions are kept the same. After four weeks, the groups have different mean heights.
Which statement best explains this difference?
The groups inherited different alleles from parents.
Minerals changed all alleles controlling plant height.
The groups experienced different conditions during growth.
Minerals caused the plants to reproduce sexually.
40 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.