Gene therapy is an example of the benefits of science for human existence.

What was the discovery that led to gene therapy?

Gene mapping was the technique that had led to the discovery of gene therapy. For gene therapy knowing the location of the genes in order to replace them with the normal genes is most important because without knowing the location of the genes gene therapy is an impossible process.

Therefore, gene mapping is the process that had led to the discovery of genetic diseases because through gene mapping we can know the location of each and every gene and thus can deduce complete genome.