The science of changing the DNA of a plant or animal to produce desirable
characteristics. Examples of desirable characteristics include fast growth and
unusually large size. This is a very controversial science
that many believe has not been adequately tested and studied. In addition, not
everyone agrees that the plants and animals that are genetically engineered are
safe for humans to eat or safe for the environment if released.

More Info:

Detailed Info on Genetic Engineering

Genetic Engineering in Food Crops