Cloning Technology
Scientific Developments and Current Guidelines
On February 24, 1997, scientists at the Roslin Institute in Edinburgh, Scotland, announced that they had cloned an adult mammal for the first time. The researchers used the nucleus of a mammary gland cell from an adult sheep and a sheep egg that had its nucleus removed. The two were fused using electrical pulses; the pulses also prompted the egg to start dividing and form an embryo. The embryo was then transferred to the uterus of a surrogate sheep, where one embryo implanted and grew to term, resulting in the birth of a live lamb, Dolly. Analyses of the genetic…
