Definition of orthogenesis in English:


Syllabification: or·tho·gen·e·sis
Pronunciation: /ˌôrTHōˈjenəsis


Biology , chiefly historical
A theory that variations in evolution follow a particular direction and are not merely sporadic and fortuitous.
More example sentences
  • Weidenreich tried to explain the seeming contradiction between isolated regional development and the unity of the human species by advancing the notion of orthogenesis, or directed evolution.
  • A once-popular hypothesized evolutionary mechanism was orthogenesis, in which change in organisms was due not to natural selection, but to internal directional trends within a lineage.
  • In contrast, other scientists imagine channeling, aka orthogenesis, to exist not only for individuals but also for species and for evolution: while there are lots of possibilities, the domain is restricted.



More example sentences
  • And a person who believes in evolution might be a devout Lamarckian or a pious Orthogenesist.


Pronunciation: /-jəˈnetik/
More example sentences
  • Basically, Newell rejected the common view according to which allometry implies nonadaptive, or orthogenetic evolution.
  • The fuel in his orthogenetic engine is ‘mutation bias’. Mutation produces novel phenotypes, but it does not produce all novel phenotypes in equal frequency in a given population.
  • Most American biologists had a looser expectation - that some progressive, or ‘orthogenetic’, force guided life in certain directions, most notably toward humanity and Anglo-American civilization.


Pronunciation: /-jəˈnetik(ə)lē/
More example sentences
  • These three groups evolved orthogenetically and remained very similar.

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Word of the day retroflex
Pronunciation: ˈrɛtrə(ʊ)flɛks
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