: Genetic engineering is the technique or method of adding new DNA to an animal or plant cell. Genes determine the characteristics of animals. Currently most of the genetic engineering efforts have been focused on agriculture. Through this technology, in adverse weather conditions , pike , rage , fungus, etc. can grow resistant plants. According to scientists, just as humans are benefiting from genetic engineering, many scientists believe that the use of this technology could lead to the birth of many new rabies germs. The early days of the practice of science began with the practice of mathematics. In the Middle Ages it played a pivotal role in the development of physics. Gradually Newton , Galileo , Einstein , Baer theories brought it to the modern age. But the trend of 1920 discovery is somewhat stagnant. Then scientists tend to study the environment , the earth , people , the living world . The 21st Century is now undoubtedly called The Century of Biological Science . This is because of Paul Berg's discovery of recombinant DNA technology or genetic engineering in 182. Genetic engineering deals with the creation of transgenic plants and animals. The reason for doing engineering at the end of the name is that only in this branch of biology one can create and design one animal by designing as per one's wish. Once a scientist decided that in goat's milk he would make yarn like a spider's web which would be the strongest yarn in the world. He succeeded through genetic engineering and created Biastel.