802 



RADIATION BIOLOGY 



Fig. 11-14. X-ray-induced fragmentation of intranuclear chromosomes of ovarian 

 eggs. Rana catesbiana. A, control; B, 2000 r, some fragmentation of chromosomes; 

 C and D, 50,000 r, much chromosome fragmentation (Duryee, 1949). 



nucleic acid. Elongation of the chromonemata of Trillium chromosomes 

 between diakinesis and the first meiotic anaphase is reduced to consider- 

 ably less than half of normal by X-raying cells in the first meiotic pro- 

 phase (Sparrow, 1946). It is suggested by Sparrow that this may result 

 from X-ray-induced DNA deficiency. 



