| 单词 | phyletic gradualism |
| 释义 | > as lemmasphyletic gradualism phyletic gradualism n. Biology a model of the evolutionary process which supposes that species arise by the gradual and continuous transformation of populations (in contrast to the punctuated-equilibrium model). ΚΠ 1972 N. Eldredge & S. J. Gould in T. J. M. Schopf Models in Paleobiol. 89 In this Darwinian perspective, paleontology formulated its picture for the origin of new taxa... We refer to it here as ‘phyletic gradualism’. 1973 Evolution 29 7/2 Modern emphasis on phyletic gradualism has been an archaic holdover from nineteenth century evolutionists' attempts to document continuous evolutionary change. 1983 C. McGowan In Beginning iii. 30 Supporters of the concept of punctuated equilibrium do not deny that species sometimes evolve by phyletic gradualism; they just consider that this is the exception rather than the rule. 1999 D. K. Simonton Origins of Genius ii. 70 Evolutionary biologists recognize that phyletic gradualism and punctuated equilibria may represent end points of a continuum. < as lemmas |
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