Recombinant DNA is a form of artificial DNA which is engineered through the combination of one or more DNA strands; this creates an organism that was not there before. In terms of genetic modification, recombinant DNA is produced through the addition of different DNA into an existing organism. However it is very hard to code or alter different traits for a specific purpose, such as immunity. Recombinant DNA is different from genetic recombination, in this your body changes within the cell or ribosome; in other words evolution, but in Recombinant DNA the DNA is exclusively engineered.