noun
: a theory in genetics: the mutafacient action of mutagenically active radiations depends upon the taking up of an effective amount of the radiation by a sensitive region of the cell
noun
: a theory in genetics: the mutafacient action of mutagenically active radiations depends upon the taking up of an effective amount of the radiation by a sensitive region of the cell
Webster's New International English Dictionary. Новый международный словарь английского языка Webster. 2012