Phyletic gradualism

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Darwin's finches by John Gould
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Phyletic gradualism is a model of evolution which theorizes that most speciation is slow, uniform and gradual.^[1] When evolution occurs in this mode, it is usually by the steady transformation of a whole species into a new one (through a process called anagenesis). In this view no clear line of demarcation exists between an ancestral species and a descendant species, unless splitting occurs. The theory is contrasted with punctuated equilibrium.