Everything about Anagenesis totally explained
Anagenesis, also known as "phyletic change", is the
evolution of species involving a change in gene frequency in an entire
population rather than a branching event, as in
cladogenesis. When enough
mutations reach fixation in a population to significantly differentiate from an ancestral population, a new
species name may be assigned. A key point is that
the entire population is different from
the ancestral population such that the ancestral population can be considered
extinct.
It is easy to see from the preceding definition how controversy can arise among
taxonomists when the differences are significant enough to warrant a new species classification. Anagenesis may also be referred to as "gradual evolution".
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