Life is surrounded by mutants
In essence, we live in an environment of mutants, only rarely think about it, because mutations often do not take such a vivid character, as the appearance of naked cats. Mutation - a random abrupt change in the genetic material (ie the number or structure of DNA) which is transmitted to the offspring. Mutations can be chromosomal or point, gene. Chromosome - due to a change in the number or structure of chromosomes, and gene - in the structure of the gene. Mutations are indifferent, helpful or harmful to their carrier (as well as breeder: it often depends on their success in breeding). Lethal - lead to the death of the organism in the early stages of its development (eg, death on the stage embryos). Some mutations cause hereditary abnormalities have been born or even a certain age animals. Some of these anomalies do not interfere with the body to live, while others cause disease and, alas, can result in death. Naturally, those manufacturers. Which have a genetic basis undesirable manifestations, must be put out of breeding.