Diabetes can be treated in some people with injections that contain the hormone insulin. The gene responsible for producing insulin in humans has been inserted into the DNA of bacteria. These bacteria then produce the human insulin that is used in the injection.
A. selective breeding
B. cloning
C. genetic engineering
Selective breeding makes use of existing, naturally present gene variants in a species? and the natural process of breeding. Genetic engineering involves a direct change to an organism's genome in the laboratory.
