Sentence:  Last week Chicago happily found its top scholar in Caltech 's acting dean of the faculty : dynamic Geneticist George Wells Beadle , 57 , who shared the 1958 Nobel Prize in medicine and physiology for discovering how genes <WSD>affect</WSD> heredity by controlling cell chemistry ( Time , Cover , July 14 , 1958 ) . 
Meaning of the word marked with <WSD> tags:  act physically on; have an effect upon