Ontogeny

Ontogeny (or ontogenesis) describes the origin and the development of an
organism from the fertilized egg to its mature form. Ontogeny is studied in
developmental biology.

The idea that ontogeny recapitulates phylogeny, i.e. that the development of
an organism exactly mirrors the evolutionary development of the species, is
discredited today. Nevertheless, many connections between ontogeny and
phylogeny can be observed and explained by evolutionary theory.

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