Mutations can occur in either cell type.
If a gene is altered in a germ cell, the mutation is termed a germinal mutation . Because germ cells give rise to gametes, some gamete s will carry the mutation and it will be passed on to the next generation when the individual successfully mates. Typically germinal mutations are not expressed in the individual containing the mutation. Somatic cells give rise to all non-germline tissues. Mutations in somatic cells are called somatic mutations .