- 
					 The change of the light-coloured variety of peppered moth (Biston betularia) to its darker variety (Biston carbonaria) is due to
 
- 
                        
- mutation
 - regeneration
 - genetic isolation
 - temporal isolation
 
 
Correct Option: A
The change in the colour of peppered moth is due to the mutation of single mendelian gene for the survival in the smokeladen industrial environment. It is called Industrial melanism.