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Genetic variation is a fact that a biological system â individual and population â is different over space. It is the base of the genetic variability of different biological systems in space.Genetic variation is based on the variation in alleles of genes in a gene pool.It occurs both within and among populations, supported by individual carriers of the variant genes. Genetic variation is brought about by random mutation, which is a permanent change in the chemical structure of a gene.enetic variation is a fact that a biological system â individual and population â is different over space. It is the base of the genetic variability of different biological systems in space.
Genetic polymorphism. Definition. noun. (1) The existence together of many forms of DNA sequences at a locus within the population. (2) A discontinuous genetic variation that results in different forms or types of individuals among the members of a single species.Supplement. Genetic polymorphism promotes diversity within a population.It often persists over many generations because no single form has an overall advantage or disadvantage over the others regarding natural selection. A common example is the different allelic forms that give rise to different blood types in humans.enetic polymorphism promotes diversity within a population. It often persists over many generations because no single form has an overall advantage or disadvantage over the others regarding natural selection.