panselectionism
/ˌpansɪˈlɛkʃ(ə)nɪz(ə)m/ /ˌpansɪˈlɛkʃənɪz(ə)m/Biology
noun
The theory or belief that natural selection is the chief driving force in evolution at all levels, and the main mechanism accounting for genetic and phenotypic polymorphism.
Origin
1970s. From pan- + selectionism.