Recombinant DNA technology is used to form DNA molecules by laboratory methods of genetic recombination that bring together genetic material from multiple sources. This creates sequences that would not be found in the genome. In regards to agriculture, there are a few obvious applications of genetic engineering. Perhaps the most obvious is the cultivation of herbicide-tolerant (HT) crops to allow farmers to use lower-priced (and less hazardous) products in their foods. Recombinant DNA technology is now being used in this area as well, as scientists seek to engineer improved strains of various herbicides, pesticides, and insecticides.
Another obvious application is the manufacture of human insulin, which is a protein used in the body to break down glucose. Until recently, there were several potential obstacles to the production of insulin; however, with the use of genetically altered cells, these problems have been solved. These cells grow and divide at a much faster rate than those produced by natural means, and therefore supply the body with much more of this important substance. Recombinant DNA technology has enabled scientists to engineer the production of insulin in a laboratory from the simple genetic coding of living organisms.
Animal studies are another example of the potential applications of genetic engineering in medicine. Animals have long been the subject of genetic experimentation, with researchers attempting to manipulate their growth and behavior in order to create pets that are more adaptable or better able to resist disease. Recombinant DNA technology now allows for the creation of genetically altered animals, and the corresponding adoption of those animals is now possible.
Most people don't think of food safety, or genetically modified food as being 'genetically modified' at all. However, in fact, geneticists have inserted strands of genetic material into plant and animal DNA in order to produce resistance to common plant and animal diseases. The process has yet to be perfected, and it's a very slow and expensive process. However, as more attention is paid to the food we eat, and the environmental impacts of growing our own food, the practice will likely become more widespread in years to come. Recombinant DNA technology has opened doors to other applications, too. It has allowed researchers to use the technology to study hereditary diseases in non-human animals, creating important tools for gene therapy and diagnostics. It has also made possible the creation of genetically altered mosquitoes and other insects that can be mosquito repellent or that killing off malaria-carrying mosquitoes that live in tropical regions.
Of course, there is still much to learn about the uses of recombinant DNA technology. Scientists understand that the properties of DNA must be expressed in order for it to function as a functional protein; they've developed a way of expressing these properties directly through nucleic acid or RNA molecules. They've also learned that one method of expressing DNA is not necessarily better than another. In fact, some researchers believe that it may be better to express the genetic information in RNAs that can be immediately passed on from one cell type to another.
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