In February 1997, Ian Wilmut and his colleagues at the Roslin Institute in Scotland announced the stunning news that they had cloned a lamb from the cells of a mature sheep. Although many animal cloning experiments had been performed in the past, they...

ON JULY 5, 1996, in a shed near the town of Roslin, Scotland, a remarkable lamb was born. The people who gathered around to observe this lamb's birth were not sheep farmers but scientists who worked at a research center called the Roslin Institute. They...

There are two distinct types of cloning: molecular and organismal. Molecular cloning is the removal of a stretch of DNA, usually a gene, from an organism, and its insertion into another piece of DNA, such as a plasmid, to form a substance called...

Cloning hit the news headlines in 1997 when scientists in Scotland announced they had successfully cloned a sheep, named Dolly, in 1996. Although several other animal species had been cloned in the previous 20 years, it was Dolly that caught the...

Cloning is the creation of an individual that is a genetic replica of another individual. The process transfers a nucleus from a somatic nonreproductive cell into an "enucleated" fertilized egg, one that has had its own nucleus destroyed...

Cloning involves creating a population of genetically identical cells by asexual reproduction. A second definition involves creating an exact replica of a gene, or gene cloning. Cloning is a natural process. Natural cloning occurs in unique ways. For...

The phenomenon of identical twins has always attracted attention. After an egg is fertilized, it begins to divide repeatedly. If the egg completely separates during the two-cell stage, identical twins will result. Both individuals will have exactly the...

The phenomenon of identical twins has always attracted attention. After an egg is fertilized, it begins to divide repeatedly. If the egg completely separates during the two-cell stage, identical twins will result. Both individuals will have exactly the...

The phenomenon of identical twins has always attracted attention. After an egg is fertilized, it begins to divide repeatedly. If the egg completely separates during the two-cell stage, identical twins will result. Both individuals will have exactly the...

Human proteins are often used in the medical treatment of various human diseases. The most common way to produce proteins is through human cell culture, an expensive approach that rarely results in adequate quantities of the desired protein. Larger...

Human proteins are often used in the medical treatment of various human diseases. The most common way to produce proteins is through human cell culture, an expensive approach that rarely results in adequate quantities of the desired protein. Larger...

A clone is a group of organisms that derive from a single ancestor and are genetically identical. A clone can be a group of mammals such as sheep, or a group of cells in culture. Cloning cells is a powerful tool in biology and medicine, since growing...

Cloning is the process of creating an identical copy of something. In biology, it collectively refers to processes used to create copies of DNA fragments (molecular cloning), cells (cell cloning), or organisms. The term also encompasses situations...