Many people likes to keep two similar things . How do you feel if you can make copy of you ? Is it possible to produce a living person exactly similar to you . Yes , it is a concept which has already been experimented . In science we called it Human cloning . There are animals success stories of genetic cloning to make a similar copy but yet human cloning is under experiment . Human cloning is the creation of a genetically identical copy of an existing, or previously existing, human being or growing cloned tissue from that individual. It does not refer to the natural conception and delivery of identical twins. Although monozygotic twins and clones might seem the same, there are a few important differencesImage result for human cloning

1 Identical twins are a matter of chance, while cloning is the result of a conscious decision.

2 The number of embryos that actually reach the end of the term limits the number of identical twins. Cloning theoretically produces an unlimited number of clones.

3  Identical twins have two biological parents, while a clone has just one genetic host. Therefore clones may have one gestational mother and one or more social parents.

4 It is assumed that if human cloning success the not only the physical appearance but also thinking pattern and behaviour would also be approximately similar.

Cloning of Bacteria 

Researchers routinely use cloning techniques to make copies of genes that they wish to study. The procedure consists of inserting a gene from one organism, often referred to as “foreign DNA,” into the genetic material of a carrier called a vector. Examples of vectors include bacteria, yeast cells, viruses or plasmids, which are small DNA circles carried by bacteria. After the gene is inserted, the vector is placed in laboratory conditions that prompt it to multiply, resulting in the gene being copied many times over.

History of cloning

Over the last 50 years, scientists have conducted cloning experiments in a wide range of animals using a variety of techniques. In 1979, researchers produced the first genetically identical mice by splitting mouse embryos in the test tube and then implanting the resulting embryos into the wombs of adult female mice. Shortly after that, researchers produced the first genetically identical cows, sheep and chickens by transferring the nucleus of a cell taken from an early embryo into an egg that had been emptied of its nucleus.

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It was not until 1996, however, that researchers succeeded in cloning the first mammal from a mature (somatic) cell taken from an adult animal. After 276 attempts, Scottish researchers finally produced Dolly, the lamb from the udder cell of a 6-year-old sheep. Two years later, researchers in Japan cloned eight calves from a single cow, but only four survived.

 

Besides cattle and sheep, other mammals that have been cloned from somatic cells include: cat, deer, dog, horse, mule, ox, rabbit and rat. In addition, a rhesus monkey has been cloned by embryo splitting.

Human cloning

Two main types of theoretical human or animal  cloning are therapeutic cloning and reproductive cloning. None of the human cloning was succeeded  yet. After a series of failures and high-profile false claims of success, the first report of stem cells created from cloned human embryos was published in 2013.

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Therapeutic cloning involves creating a cloned embryo for the sole purpose of producing embryonic stem cells with the same DNA as the donor cell. These stem cells can be used in experiments aimed at understanding disease and developing new treatments for disease. To date, there is no evidence that human embryos have been produced for therapeutic cloning.

The richest source of embryonic stem cells is tissue formed during the first five days after the egg has started to divide. At this stage of development, called the blastocyst, the embryo consists of a cluster of about 100 cells that can become any cell type. Stem cells are harvested from cloned embryos at this stage of development, resulting in destruction of the embryo while it is still in the test tube.

The scientific uses of cloning

Researchers hope to use embryonic stem cells, which have the unique ability to generate virtually all types of cells in an organism, to grow healthy tissues in the laboratory that can be used replace injured or diseased tissues. In addition, it may be possible to learn more about the molecular causes of disease by studying embryonic stem cell lines from cloned embryos derived from the cells of animals or humans with different diseases. Finally, differentiated tissues derived from ES cells are excellent tools to test new therapeutic drugs.

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