We use cookies to enhance your experience on our website. This website uses cookies that provide targeted advertising and which track your use of this website. By clicking ‘continue’ or by continuing to use our website, you are agreeing to our use of cookies. You can change your cookie settings at any time.ContinueFind out more
A theory that variations in evolution follow a particular direction and are not merely sporadic and fortuitous.
‘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.’
‘Mutation bias is not enough to produce orthogenesis, however.’
‘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.’
‘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.’
‘The data is inconsistent with orthogenesis, and somehow thinks that because he can draw a line from an extant animal to its many-times-great grandparents, he has supported directed evolution.’