Dolly the sheep was produced by
- A. fertilising an egg in a test tube
- B. transferring the nucleus of an adult body cell into an enucleated egg cell
- C. inserting a human gene into a sheep embryo
- D. splitting a very early embryo into two
Explanation
Somatic cell nuclear transfer showed for the first time that the nucleus of a fully differentiated adult cell can be reprogrammed to direct the development of a whole new animal. The lamb was genetically identical to the sheep that donated the nucleus rather than to the egg donor or the surrogate mother. Splitting an early embryo also gives clones, but that is how natural identical twins arise, not how Dolly was made.
Related questions
A restriction endonuclease is used in genetic engineering to
The enzyme used to seal the gene permanently into the plasmid is
Human insulin for diabetic patients is now produced mainly by
The polymerase chain reaction is used to
In gel electrophoresis, DNA fragments move towards the positive electrode because