Genetically engineering is totally different than Natural Selection and natural breeding methods. Natural breeding is referred to as “vertical” breeding. Changes in the DNA and changes in traits are derived from the parents within the same species. The most invasive type of genetic engineering uses “horizontal” breeding techniques, only available in a laboratory. Horizontal breeding inserts genes from “other” species, randomly into another species with uncontrollable results.
A more technical distinction between the two techniques for breeding might be Cisgenesis for Vertical breeding and Transgenesis for horizontal breeding.
GMO corn is produced using Transgenesis techniques. Corn is susceptible to insects in the larvae stage. In order to kill the insects, a bacteria (Bacillus thuringiensis) that is toxic to the insect larvae is inserted into the genome of the corn. This specific toxin known as Bt attacks the digestive system of the insects by breaking down the cell walls of their stomachs.
Eye on the Ball 