172 CHAM i k 37 



QUESTIONS FOR DISCUSSION 



37.1. Could you detect the transposition oi a \fodulator to a locus near /'"'.' Explain. 



37.2. Whj does a light variegated individual of maize, with a transposed Modulator on 

 the same chromosome as /' Mp produce among the F, offspring more than one 

 quarter lights and less than one quarter mediums when this individual is hack- 

 crossed to nonred (P" /'" ')? 



37.3. Could genes similar to Modulator he the cause of relatively rare "mutants" of 

 amorphic, hypomorphic. and neomorphic types? Upon what do you base your 

 opinion? 



37.4. Do experimental results with corn have any hearing upon the hypothesis that 

 the operator gene is nothing more than the initial portion of the nucleotide 

 sequence o\' a transcriptional unit of DNA? Explain. 



37.5. Is paramutation a normal mechanism for controlling gene action? Explain. 



37.6. Compare the mechanisms for controlling gene action in maize and Salmonella. 



