THE CHROMOSOMES 



89 



Metabolic Stage Prophase 



Metophase 



Anaphase 



CHROMOSOME 

 BREAK 



CHROMATID 

 BREAKS 



HALF- 



CHROMATID 



BREAK 



Fig. 61. — Diagram illustrating the metliod of investigating the number of chromonemata 

 in a chromosome by means of X rays. Explanation in text. 



