Selective methods. The secular process is based on artificial selection - The choice by a person of the most valuable animal, plant and micro-organisms in order to further develop their progeny with the desired characteristics and properties. There are two main types of selection: mass and individual.

Mass selection is a group of individuals similar to one or more of the desired characteristics (i.e. fenotype selection) without checking their genotype. For example, thousands of plants Wheat For further reproduction, only plants that are resistant to bedding and have large collos shall be retained. In future generations, plants with appropriate qualities are again selected.

The main features of this method are its simplicity, cost-effectiveness and the possibility of relatively rapid improvement of local varieties and species. Insufficientness is the impossibility of individual progeny assessment, so the selection results are unstable (the descendants can be splintered, which means that not all individuals will inherit valuable signs).

Individual selection (genothip) produces and evaluates the progeny of each individual organism in a number of generations, with the obligatory control of the inheritance of an interesting breeder. In subsequent selection phases, only those with the highest number of descendants with high rates are used.

Such a selection is most effective among self-smelting plants (wheat, yap, etc.), as it leads to net lines with maximum degree of homosis. However, a large number of identical descendants can be obtained from a single plant through sexless and sexual reproduction.