Many animals are cloned over the past fifty years. It first started in the 1950s when scientists were able to clone frogs, producing identical individuals that carry the genetic characteristics of only a single parent. Then, mice were first successfully cloned in the 1980s. These animals are small animals that do not have complex body organs like human beings body. Therefore, the cloning of a small animal is far more easier than cloning an adult mammal with complex body organs. Many rumors had been spread about many human beings that had been cloned. But until now there are no evidences that the creation of a human being clone had been successfully achieved.
             The experiment that I would like to discuss is the first success in cloning an adult mammal. It was achieved by a team of British researchers led by Ian Wilmut at the Roslin Institute in Edinburgh, Scotland, in 1996. After having already produced clones from sheep embryos, they were able to produce a lamb, named Dolly. To create the clone, the nucleus of a cell from the mammary gland which is the milk-producing gland characteristic of all female mammals from an adult sheep was implanted in another sheep's unfertilized egg whose nucleus had been removed. The secret with the nucleus is that it contains all of the information about creating the human body called the DNA. The DNA 30,000 to 40,000 genes . The nucleus is then implanted into the recipient egg. An electrical current is applied to simulate the burst of energy that occurs during fertilization. The egg begins dividing normally and becomes an embryo, which is implanted into another ewe. The lamb that is born is a clone of the donor of the original mammary cell. The egg spends about seven months until the egg develops into a baby lamb.
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