orthogenetic
/ɔrθoʊdʒəˈnɛtɪk/
adjective
- Relating to or following a straight-line, predetermined pattern of evolution.
- Some species show an orthogenetic trend in the fossil record, such as steady increase in body size.
- The scientist argued that orthogenetic changes are not directed by any external force.
- The orthogenetic model of development has been largely replaced by more complex theories.
Synonyms