Dolly the sheep: How one clone changed science forever

By Shaniyahh Riddick/Wiley High School

Dolly the sheep was the first mammal ever cloned from an adult cell, born in 1996 at Scotland’s Roslin Institute through a process called somatic cell nuclear transfer.

Shaniyahh Riddick

Scientists used DNA from an adult sheep to create a genetically identical copy — proving that adult cells still carry all the genetic information needed to build a whole new organism.

The breakthrough reshaped research in genetics, stem cells, and regenerative medicine, while also launching ethical debates that continue today over whether cloning should extend to other animals, or humans.

During her life, Dolly had several healthy lambs of her own, showing that cloned animals could reproduce normally.

She died in 2003 after being diagnosed with arthritis and a progressive lung disease health issues that fueled questions about whether cloning might accelerate aging.

Even so, Dolly remains one of the most important animals in biotechnology history, a lasting symbol of how far genetic science has come.