Questions and Problems 229 



ing them in crystalline form and the philosophical implications of such 

 a discovery. Has any possible relation between viruses and genes ever 

 been suggested? 



3. What effect did the theory of mutations have on the theory of 

 evolution ? 



4. What would be the state of our knowledge of the transmission of 

 genes if gene mutation had never occurred? Explain. 



5. Does a newly appearing phenotype always indicate a point muta- 

 tion ? Explain. 



