noun
mutationism
A historical biological theory emphasizing the role of large mutations in evolution, often contrasted with Darwinian gradualism.
突然変異説は、進化が突然変異によって大きく進むと考える学説だ。
Mutationism is a theory that considers evolution to proceed in large steps through mutations.
Compound of 突然変異 (mutation) + 説 (theory). The term is a direct calque of the English 'mutationism'.