Genetically-engineered tomato. Conceptual image of a tomato being injected with syringes filled with DNA (deoxyribonucleic acid). This image may depict the concept of genetically-engineered food. The syringe represents the introduction of DNA into the tomato's genes. Genetic engineering makes it possible to introduce DNA into an organism that may have originated in an entirely different species. This is impossible to achieve by conventional breeding. The DNA may make the tomato resistant to fungal moulds, or enable the fruit to ripen on the plant without softening which improves its flavour.