A group of individuals in a population united by a similar genotype.

A group of organisms belonging to a local population that share the same genotype and are similar in almost all characteristics. In the 20s-30s of the 20th century. In the 20th century, many biologists (Swedish botanist G. Turesson, Soviet biologists N. I. Vavilov, M. A. Rozanova, etc.) considered the biotype to be the smallest taxonomic unit. According to them, species are formed from a number of biotypes as a result of recombination and selection.

Biological types, or life forms, are also large groups of organisms, often consisting of many species and characterised by similar adaptations to use certain habitats.