The direct manipulation of an organism's genes, including heritable and nonheritable recombinant DNA constructions, is referred to as genetic engineering. Traditionally, humans have controlled breeding and selected offspring with desired qualities to influence genomes indirectly. The alteration of one or more genes is referred to as genetic engineering. To give an organism a desirable phenotype, a gene from another species is usually inserted to its genome. Genes can also be transferred from an animal to a plant and vice versa. GMOs, or genetically modified organisms, is another term for this. With the advent of genetic engineering, biological systems, including microbes, have been subjected to new levels of change. Genetic engineering is the bedrock of modern scientific research, and it has been used for a variety of purposes, including the production of multidrug-resistant biological weapons and viral vectors to treat human blindness. One of the drawbacks of selective breeding is that it can result in undesirable features. Scientists can use genetic engineering to implant only one gene at a time. This prevents the introduction of genes that have undesired properties. Genetic engineering also aids in the creation of new foods with desired characteristics.