The egg begins dividing normally and becomes an embryo, which is implanted into another ewe. The lamb that is born is a clone of the donor of the original mammary cell. The practical applications of cloning are economically promising but philosophically unsettling. Animal breeders would welcome the chance to clone top-quality livestock. Genetically engineered animals could be cloned in large numbers to increase the production of drugs or human proteins that are useful in fighting disease.
Clones are also highly useful in biological research because of their genetic uniformity.
The cloning of human beings is a subject fraught with ethical and moral controversy. If cloning can ensure the infinite replication of specific genetic traits, a judgment would need to be made as to which traits are desirable and therefore worthy of perpetuation. The persons empowered to exercise such judgment would be in a position to change the course of human development. The use of recombinant DNA technology to manipulate and change genes is sometimes called gene cloning. The Invention of the Genetic Code - on the work of Watson and Crick.