Questions and Problems 79 



3. Does the presence of two X's or of an X and a Y have any effect 

 on the somatic divisions of an organism ? If so, what is the effect ? 



4. By a series of diagrams show how the formation of many new 

 chromonemata within a common matrix could produce banded structures 

 such as are found in sahvary gland chromosomes. 



5. What is the significance, if any, of the chromocenter? Is it an 

 essential feature of salivarv gland nuclei? 



