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phyletic gradualism

   Also found in: Wikipedia 0.01 sec.
phyletic gradualism [fī′led·ik ′gra·jə·wə‚liz·əm]
(evolution)


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While punctuated equilibrium (PE) reflected in the fossil record is a strong negative evidence to the underlying principle of phyletic gradualism (PG) enshrined in the evolutionary theory, the phenomenon of cell-directed mutagenesis challenges another tenet of the theory, namely, the requirement of stochastic mutations produced by extra-cellular agents to create heritable changes in the organism.
Gould, paleontologists, published "Punctuated Equilibria: an Alternative to Phyletic Gradualism.
 
 
 
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