|profound change in form from one stage to the next in the life of an organism, as from the caterpillar to the pupa and then to the adult butterfly|
|a widely distributed group of photosynthetic prokaryotic organisms, resembling phototrophic bacteria, occurring in diverse habitats|
|1.||a group of organisms or cells of the same genetic constitution that are descended from a common ancestor by asexual reproduction, as by cuttings, grafting, etc, in plants|
|2.||Also called: gene clone a segment of DNA that has been isolated and replicated by laboratory manipulation: used to analyse genes and manufacture their products (proteins)|
|3.||informal a person or thing bearing a very close resemblance to another person or thing|
|a. a mobile phone that has been given the electronic identity of an existing mobile phone, so that calls made on the second phone are charged to the owner of the first phone|
|b. any similar object or device, such as a credit card, that has been given the electronic identity of another device usually in order to commit theft|
|5.||to produce or cause to produce a clone|
|6.||informal to produce near copies (of a person or thing)|
|7.||slang (tr) to give (a mobile phone, etc) the electronic identity of an existing mobile phone (or other device), so that calls, purchases, etc made with the second device are charged to the owner of the first device|
|[C20: from Greek klōn twig, shoot; related to klan to break]|
An organism descended asexually from a single ancestor, such as a plant produced by layering or a polyp produced by budding.
A replica of a DNA sequence, such as a gene, produced by genetic engineering.
To make multiple identical copies of a DNA sequence.
To establish and maintain pure lineages of a cell under laboratory conditions.
To reproduce or propagate asexually.
|clone (klōn) Pronunciation Key
A living system that is genetically identical to its ancestor (that is, it has exactly the same DNA molecules). Because each cell contains the DNA molecules that characterize an individual, it is, in principle, possible to replicate, or reproduce, complex living systems in the laboratory.
Note: The first cloned mammal, a sheep named Dolly, was born in Scotland in 1996. DNA from an adult donor was placed into an egg, which was then implanted in the uterus of another sheep. Since that time, mice, cows, and pigs have been cloned.
Note: There is a major debate on the ethical aspects (see bioethics) of cloning, especially as applied to human beings. Therapeutic cloning involves the placing of adult DNA in an egg for the express purpose of creating stem cells for medical purposes. Reproductive cloning involves the placement of adult DNA into an egg and the implantation of the egg into a uterus for the purpose of creating a viable fetus.
Note: Clone is often used informally to indicate a close copy or resemblance: “This new computer is a clone of the IBM model.”