Binary and multiple fission constitute the primary mechanisms of asexual reproduction in unicellular organisms, wherein a single parent cell undergoes mitotic division to generate genetically identical offspring. The core theoretical principle defines fission based on the number of daughter cells produced—binary fission yielding two cells and multiple fission yielding numerous cells—and the axis of division, which is determined by structural constraints such as the presence of a flagellum. This mechanism serves as the fundamental reproductive strategy for protozoans and certain bacteria, distinguishing cellular replication in asexual organisms from tissue growth in multicellular entities.
Prerequisite chain context: requires Flagellar Structure and Function in Protists.