Gene for gene hypothesis is proposed by

Answer: Option C

Gene for gene hypothesis is proposed by Harold Flor.
The gene-for-gene hypothesis proposed by Harold Flor, based on his pioneering work on flax and the flax rust fungus Melampsora lini, states that for every dominant avirulence (Avr) gene in the pathogen.
The gene-for-gene hypothesis states that for each gene controlling resistance in the host, there is a corresponding, specific gene controlling avirulence in the pathogen.