Animals (most typically mice) that have had a foreign gene put into their genome are known as transgenic animals.
Scientists discovered a novel approach to evaluate the functionality of genes by inserting alien genes or genes written slightly differently than typical.
Transgenesis is the process of introducing a foreign gene with desirable traits into the target animal's genome.
The transgene is the foreign gene that is inserted, and the transgenic animal is the one whose genome has been transformed.
The genes are handed down through the generations.