Evolutionary changes of species, variability between the individuals and the mechanism of legacy between parents and descendants of ancient times interest scientists. Big influence on these issues carries an additive variance. It is passed from generation to generation and affects the similarity between parents and descendants. It carries most of the genetic variance, increasing with the level of inbriding. It has also been found that over time the epistatic variance can be transformed into an additive variant. By using it we estimate heritability. Heritability is most likely a discrete measure of quantitative genetics. It determines the speed of phenotype development as a response to the selection, whether it is natural or artificial. In assessing heritability, the problem creates epigenetics and phantom heritability that has not yet been fully explored. Additive variance as well as heritability are quantified genetic issues. It is based on a model in which many genes affect complex features, adding importance to non-neglecting factors. Nowadays, QTLs and SNPs are used for its expression. Which requires strong computers that have the ability to process large data at the same time. The aim of this paper was to establish the development of estimates of additive variations through history to date and the problems encountered by scientists during the evaluation.