Dolly the sheep may have been the world’s most famous clone, but she was not the first. Cloning creates a genetically identical copy of an animal or plant. Many animals – including frogs, mice, sheep and cows – had been cloned before Dolly. Plants are often cloned – when you take a cutting, you are producing a clone. Human identical twins are also clones.
So Dolly was not the first clone, and she looked like any other sheep, so why did she cause so much excitement and concern? Because she was the first mammal to be cloned from an adult cell, rather than an embryo. This was a major scientific achievement, but also raised ethical concerns.
Since 1996, when Dolly was born, other sheep have been cloned from adult cells, as have mice, rabbits, horses and donkeys, pigs, goats and cattle. In 2004, a mouse was cloned using a nucleus from an olfactory neuron, showing that the donor nucleus can come from a tissue of the body that does not normally divide.
How was Dolly produced?
Producing an ...
Want to see the rest of this article?
Would you like to see the rest of this article and all the other benefits that Issues Online can provide with?
- Useful related articles
- Video and multimedia references
- Statistical information and reference material
- Glossary of terms
- Key Facts and figures
- Related assignments
- Resource material and websites