That's not quite right. The science dealing with altering genetic materials in living organisms is called Genetic Engineering or Genetic Modification.

Here's why:

* Engineering is a broad field that encompasses the design, construction, and operation of structures, machines, systems, and processes. While it can be applied to many aspects of biology, it's not specifically focused on genetic manipulation.

* Genetic Engineering specifically focuses on altering the genetic makeup of organisms, often by adding, deleting, or modifying genes. This can be used for a variety of purposes, including:

* Developing new crops: Creating crops that are resistant to disease, pests, or herbicides.

* Producing pharmaceuticals: Developing organisms that produce drugs or other therapeutic compounds.

* Treating diseases: Using gene therapy to repair faulty genes or introduce new ones.

So, while engineering principles might be used in the development of genetic engineering techniques, genetic engineering itself is a distinct field of science.