a distinguishing quality or characteristic, typically one belonging to a person.
trait
elective breeding is the process by which humans use animal breeding and plant breeding to selectively develop particular phenotype traits by choosing which typically animal or plant males and females will sexually reproduce and have offspring together.
selective breeding
the process whereby organisms better adapted to their environment tend to survive and produce more offspring. The theory of its action was first fully expounded by Charles Darwin and is now believed to be the main process that brings about evolution.
natural selection