Genetically modified (GM) crops are crops made out of organisms whose genes have been modified in a way that does not occur naturally. A gene is a sequence of DNA that contains information that determines a particular characteristic/trait. All organisms have DNA, located in the chromosomes. . Crops that are developed through genetic modification are referred to as genetically modified (GM) crops or transgenic crops or genetically engineered (GE) crops. Most existing genetically modified crops have been developed to improve yield, through the introduction of resistance to plant diseases or of increased tolerance of herbicides.