Germinal variations are more important because they are inherited to the offsprings and they are regarded as the raw material of adaptation and evolution.
Somatic variation is of no importance for evolution; as such differences are not in general transmissible to offspring and, therefore, are not the basis for evolutionary adjustment.
Some genetically changes represent only a breakdown of genes and genetic mechanism and they cause drastic changes unfitting in their effects on the individuals showing them, therefore, tend to be weeded out by natural selection. As a result, they appear as rare abnormalities in a population and are present mainly because they continually reappear through mutations.
Continuous variation is most important in relation to evolution. From variation, Darwin’s adaptive change is deduced. The continuous variation is also concerned to plant and animal breeders and is mainly of great significance.