Definitions for orthogenesisˌɔr θoʊˈdʒɛn ə sɪs
Random House Webster's College Dictionary
or•tho•gen•e•sisˌɔr θoʊˈdʒɛn ə sɪs(n.)
evolution of a species proceeding by continuous structural changes without presenting a branching pattern of descent. a theory that such evolution of a species is due to a predetermined series of alterations and not subject to natural selection.
a hypothetical parallelism between the stages through which every culture necessarily passes in spite of secondary conditioning factors.
Origin of orthogenesis:
A series of similar mutation in successive generation, producing evolutionary change.
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