Members of the same species show variation in their characteristics.
Name the two causes of genetic variation.
A person has a scar on their arm.
State the type of variation shown by the scar.
State what is meant by a mutation.
Identical twins have the same alleles. One twin has a greater body mass than the other twin.
Give one reason for this difference in body mass.
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.