Ontogeny

Although Stephen Jay Gould's 1977 book Ontogeny and Phylogeny helps to reassess Haeckelian embryology, it does not address the controversy over Haeckel's embryo drawings.

Consequently, it is argued the species represents a unique ontogeny unlike any extant ape.

Flower ontogeny uses a combination of genes normally responsible for forming new shoots.

Generally, if a structure pre-dates another structure in evolutionary terms, then it often appears earlier than the second in an embryo; this general observation is sometimes summarized by the phrase " ontogeny recapitulates phylogeny ".

Gould, Ontogeny and Phylogeny, p. 56 Von Baer’s embryo drawings Where are these drawings?

It was often expressed as " ontogeny recapitulates phylogeny", i.e. the development of a single organism during its lifetime, from germ to adult, successively mirrors the adult stages of successive ancestors of the species to which it belongs.

Nature and nurture A seminal paper named ontogeny as one of the four primary questions of biology, along with Huxley's three others: causation, survival value and evolution.

Ontogeny, embryology and developmental biology are closely related studies and the terms are sometimes used interchangeably.

Ontogeny is also a concept used in anthropology as "the process through which each of us embodies the history of our own making".

Ontogeny is the growth (size change) and development (shape change) of an individual organism; phylogeny is the evolutionary history of a species.

Pp. 136–142 Since early in the twentieth century, Haeckel's "biogenetic law" has been refuted on many fronts. citation Haeckel formulated his theory as "Ontogeny recapitulates phylogeny".

Taruskin claims the historical development of the Passion (its ontogeny) as a work with an anti-Semitic message does, in fact, inform the work's identity (its ontology), even though that was an unlikely concern of the composer.

The hypothesis that ontogeny recapitulates phylogeny has been applied and extended in a number of areas, including cognition and mental activities.

The studies of ontogeny, phylogeny and especially evolutionary developmental biology of both vertebrates and invertebrates offer considerable insight into the evolution of all life, including how humans evolved.

This ancestral character state appears only during these early stages, supporting the notion that ontogeny reflects phylogeny.