262 The Induction oj Gene Mutations 



2 Assume that in radiating a leaf primordium you caused a single 

 dominant gene affecting leaf shape to mutate to a recessive allele. Could 

 you detect the mutation? Would it be transmitted to later generations? 

 Would your answers to these questions be different if (1) the mutation 

 were from a recessive to a dominant; (2) somatic crossing over took 

 place- (3) the plant could be propagated vegetatively by cuttings? 



3. 'why is the CIB method simpler than methods used for detecting 



lethals in autosomes? 



4. Why is it necessary to use a crossover suppressor when studying 



induced lethals by the CIB method? 



