Dolly the Sheep

Dolly the Sheep was a female Finn Dorset sheep and the first mammal cloned from an adult somatic cell.

Dolly the Sheep was a female Finn Dorset sheep and the first mammal cloned from an adult somatic cell. Created at the Roslin Institute near Edinburgh, Scotland, she was announced in 1997 and became a landmark in cloning research and bioethics. Dolly lived from 1996 to 2003 and remains a well-known symbol of modern biotechnology.

Creation

Dolly was cloned using somatic cell nuclear transfer, in which the nucleus from an adult mammary cell was inserted into an egg cell with its nucleus removed. The reconstructed embryo was implanted into a surrogate mother, who gave birth to Dolly.

Scientific significance

Dolly’s birth challenged the assumption that adult mammalian cells could not be reprogrammed to produce a new animal. The result helped establish cloning as a viable scientific technique and influenced later research in developmental biology and genetics.

Public reaction and debate

The announcement of Dolly’s existence drew major international attention. It also intensified debate over the uses of cloning in medicine, agriculture, and the possibility of human cloning.

Later life and death

Dolly lived for several years after her birth and produced offspring through normal reproduction. She died in 2003 and became an enduring symbol of cloning research.