1 : of, relating to, or appearing in the course of ontogeny. 2 : based on visible morphological characters.

What is Ontologeny?

Ontogeny is the development of a single individual, or a system within the individual, from the fertilized egg to maturation and death.1. From: Physiology of the Gastrointestinal Tract (Sixth Edition), 2018.

What is an example of ontogeny?

Ontogeny and phylogeny. By studying ontogeny (the development of embryos), scientists can learn about the evolutionary history of organisms. ... For example, both chick and human embryos go through a stage where they have slits and arches in their necks that are identical to the gill slits and gill arches of fish.