Ontogenesis Apr 2026

: The process begins at fertilization [15]. For many species, this includes critical stages like cleavage, gastrulation (the formation of cell layers), and organogenesis [9].

: Some species experience dramatic shifts during ontogenesis, such as a tadpole’s transformation into a frog [11]. ontogenesis

Ontogenesis, derived from the Greek onto ("being") and genesis ("origin") [28], is the sweeping "story" of how a single cell transforms into a complex, mature individual [15, 25]. It encompasses the entire physical, psychological, and behavioral development of an organism throughout its lifespan [25]. The Biological Story: From Zygote to Adult : The process begins at fertilization [15]

In the biological sense, ontogenesis describes the chronological phases an organism undergoes to reach its final form: this includes critical stages like cleavage