Reproductive cloning is a scientific technique used to create a genetically identical copy of an organism. This process involves transferring the nucleus of a somatic cell from the organism to an egg cell that has had its nucleus removed. The resulting embryo can then be implanted into a surrogate mother, leading to the birth of a clone. One of the most famous examples of reproductive cloning is Dolly the sheep, who was born in 1996 as the first mammal cloned from an adult somatic cell. Reproductive cloning raises ethical questions and concerns about biodiversity, animal welfare, and the implications for human cloning.