出典:Wiktionary
anagenesis (usually uncountable, 複数形 anageneses)
出典:Wikipedia
出典:『Wikipedia』 (2011/04/19 13:31 UTC 版)
Anagenesis, also known as "phyletic change," is the evolution of species involving an entire population rather than a branching event, as in cladogenesis. When enough mutations have occurred and become stable in a population so that it is significantly differentiated 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. A series of such species is collectively known as an evolutionary lineage.