THE FEMALE 



63 



^ 





..r^.'-^: 



Paired chromosomes showing 



^'chromomeres and side loops ^^'"^, '*'"":'^*'- ''^^ 



» ' 



Pair of chromosomes 





^^- 



Chromosomes in the amphibian nucleus. Stage 5 of the growing oocyte show- 

 ing the isolated nucleus and its paired chromosomes with chromomeres and side 

 loops. (Courtesy, W. R. Duryee, Laboratory of Terrestrial Magnetism, Wash- 

 ington, D. C.) 



