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Topic last updated: 30 Sept 2021

- Biology
- PSHE / Citizenship studies
- 14-16
- 16+
- 55

Cloning

9 of 11

Cloning summary

	Reproductive cloning		Artificial twining	Therapeutictherapeutic Healing. A therapeutic treatment is one that works to treat a disease. cloning
	Somatic cell nuclear transfersomatic cell nuclear transfer Somatic cell nuclear transfer (SCNT) is the process by which the nucleus from one adult cell is transferred to an empty egg cell from another individual, and triggered into division by a tiny electric shock. This produces an early embryo, and at the blastocyst stage the embryonic stem cells are harvested and the cloned embryo destroyed.	Embryoembryo The name for a group of cells that are developing into a fetus. In humans this is from implantation to the 8th week of development. nic cell nuclear transfer	Artificial twining
What is created?	An adult organism	An adult organism	An adult organism	A blastocyst (early embryo) which has its stem cellstem cell Cells which can divide repeatedly without becoming differentiated and have the capacity to develop into a diverse range of specialised cell types. s harvestedharvested Refers to a useful substance that has been extracted.
Is it human?	No – this would be illegal.	This would be illegal in the UK unless it was to produce an embryo with three parents to prevent mitochondriamitochondria Organelle(s) within cells that produce ATP, used as a store of chemical energy. Often called the cell's powerhouse l disease.	No – this would be illegal. Some people think it should be allowed in special circumstances	Yes, but it is strictly regulated. The cells can be human (a human nucleus and egg), non-human or hybrid (a human nucleus and non-human egg).
What is it a clone of?	The genetic parent which donated the nucleus.	The early embryo nucleus-donor. The donor embryo isn't developed into an adult, so the only living organism with identical genetic material is another clone of the embryo generated at the same time (if one was created).	Its twin.	The genetic parent which donated the nucleus – usually a patient.
What method is used?	SCNT. Genetic engineeringgenetic engineering Genetic engineering involves changing the DNA of an organism, usually by deleting, inserting or editing a gene to produce desired characteristics. can be carried out at the same time.	Embryonic cell nuclear transfer. Genetic engineering can be carried out at the same time.	Embryo splitting. Genetic engineering can't be easily carried out at the same time.	SCNT. Genetic engineering can be carried out at the same time.
Since when?	1962 – Gurdon transferred a frog intestinal cell nucleus to a frog egg, which developed into a tadpole.	1952 – Briggs and King transferred a frog embryo nucleus to an enucleated frog egg, which developed into a tadpole.	1891 – Hans Driesch split a sea urchin embryo which developed into two sea urchins.	Therapeutic cloning of mouse somatic cells achieved in 2000, and of human somatic cells in 2013.
What are the clones used for?	To improve breeding stock in farm animals. To increase numbers of endangered animals and try to revive extinctextinct Extinct is when all of the animals or plants in that species die. species. Transgenic clones can create medical products for humans.	Their creation tests the possibilities and allows researchers to refine techniques and methods for SCNT. Enables women with faulty mitochondria to produce children free from the disease.	To improve breeding stock in farm animals.	The stem cells produced can be used to study genetic diseases, test treatments and create tissues (and organs?) for transplanttransplant The process of replacing a damaged or diseased organ with a healthy organ from a dead or living donor. .
Advantages	Can clone an animal with known traits.	Genetic material requires relatively little reprogramming.	Can be seen as ethically less wrong because it mimics a natural process. Techniques used are relatively simple.	There is no risk of immune rejectionrejection The process by which the immune system of the body can reject a transplanted organ. if the cells are re-implanted in patients. Can be seen as ethically less wrong because the potential benefits outweigh the negative aspects.
Disadvantages	Problems with reprogramming of genetic material. Problems once the embryo is transferred into a surrogate mother.	Problems once the embryo is transferred into a surrogate mother.	Some problems once the embryo is transferred into a surrogate mother.	Problems with reprogramming of genetic material.