Modern Co-opted Usage
Though linear teleological evolution has been refuted, it is not true that evolution never proceeds in a linear way, reinforcing characteristics, in certain lineages at times, for example, during a period of slow, sustained environmental change, but such examples are entirely consistent with the modern neo-Darwinian theory of evolution. These examples have sometimes been referred to as orthoselection (e.g. by Jacobs et al. 1995; Ranganath & Hägele, 1981) but are not strictly orthogenetic, and simply appear as linear and constant changes because of environmental and molecular constraints on the direction of change.
Read more about this topic: Orthogenesis
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