A study compares two groups of plants. One group consists of genetically identical cuttings. The other consists of plants grown from seeds produced by sexual reproduction. Both groups are grown in a range of light intensities. No new mutations occur.
Which statement best describes the possible causes of variation within each group?
Cuttings can vary environmentally; seedlings can vary genetically and environmentally.
Variation in both groups must result only from genetic differences.
Variation in both groups must result only from environmental differences.
Cuttings can vary genetically; seedlings can vary only through environmental differences.
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.