Genetic Engineering: Cloning

Paper Summary:

This paper defines cloning as the production of a group of genetically identical cells or organisms, all descended from a single individual. The members of a clone have precisely the same characteristics, except where mutation and environmentally caused developmental variation have occurred. The first recorded cloning experiment took place in 1938, when a German scientist experimented by transferring a nucleus from an adult cell to an enucleated egg which resulted in the successful creation of an identical twin. This paper details the various types of artificial and natural cloning which include: Molecular cloning, cellular cloning, embryo twinning, natural regeneration, primary reproductive mode and supplementary reproductive mode. The writer of this paper also discusses the moral and ethical controversy surrounding genetic cloning.

From the Paper:

"Some examples of cloning from nature are the primary reproductive mode and supplementary reproductive mode. The primary reproductive mode occurs in species whose reproduction is strictly asexual; each population consists of one or more clones, depending on the number of individuals in the colony there was to start. Such species include all bacteria and blue-green bacteria, most protozoans, algae, some yeast, and even some higher plants and animals, such as dandelions and flatworms. Supplementary reproductive mode occurs in some algae, which reproduce sexually and asexually. Those individuals formed by asexual reproduction, called zoospores constitute a clone. In the club mosses and some higher plants, a runner, or stem, grows horizontally along the surface of the soil and at intervals produces roots and upright stalks. When the sections of stem between stalks disintegrate, the separated individuals constitute a clone."

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