orthogenesis

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or·tho·gen·e·sis

(ōr'thō-jen'ĕ-sis),
The doctrine that evolution is governed by intrinsic factors and occurs in predictable directions.
[ortho- + G. genesis, origin]
Farlex Partner Medical Dictionary © Farlex 2012

orthogenesis

(ôr′thō-jĕn′ĭ-sĭs)
n.
1. Biology The hypothesis, now largely discredited, that the evolution of species is linear and driven largely by internal factors rather than by natural selection.
2. Anthropology The hypothesis that all cultures evolve in a linear manner from primitivism to civilization.

or′tho·ge·net′ic (-jə-nĕt′ĭk) adj.
or′tho·ge·net′i·cal·ly adv.
The American Heritage® Medical Dictionary Copyright © 2007, 2004 by Houghton Mifflin Company. Published by Houghton Mifflin Company. All rights reserved.

orthogenesis

a discredited theory of evolution which held that development took place along predetermined lines unaffected by selective processes.
Collins Dictionary of Biology, 3rd ed. © W. G. Hale, V. A. Saunders, J. P. Margham 2005
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