Summary
Highlights
Dolly, the most famous sheep, was the first mammal cloned from an adult somatic cell. The video introduces the concept of cloning and how Dolly came to be without traditional reproduction.
Clones are organisms that share the same genetic information, meaning they are genetically identical. Asexual reproduction is a natural way to create clones, contrasting with sexual reproduction where genetic information comes from both parents.
Dolly was born in 1996 through artificial cloning. She had multiple 'mothers', each with a specific role in the cloning process, rather than biological parents.
The process involved three sheep: one provided an egg cell with its nucleus removed, another provided a somatic cell from which the nucleus (containing all genetic information) was isolated. This nucleus was transferred into the enucleated egg to form a hybrid cell. An electrical stimulus triggered cell division, developing into a blastocyst. This blastocyst was then implanted into a third sheep, the surrogate mother, who carried Dolly to term.
Dolly had the exact genetic information as the sheep that donated the somatic cell's nucleus, not the surrogate mother. Dolly lived for almost 7 years and even had offspring of her own.