PLATE 12 
EXPLANATION OF FIGURES 
Complexes from atypical individual 2525 
111, like figure 110 of plate 11, is an anaphase illustrating the occasional divi- 
sion of the unpaired supernumerary in the first mitosis. Note that when this 
occurs the supernumerary lags behind the other chromosomes somewhat in 
division. 
112 A late first spermatocyte anaphase with the extra tetrad (S) not yet 
divided. 
113 Second spermatocyte telophase with twelve monads at each pole. 
114 and 117 Second spermatocyte metaphase spindles, showing in each case 
the entire complex of eleven dyads plus one monad. The monads (S) have 
resulted from the division of the extra dyad in the first mitosis and are here seen 
passing to the poles without, of course, dividing. 
115 A second spermatocyte telophase with fourteen monads at the upper 
pole and thirteen at the lower. This complex was derived from a-group like 
that seen at the upper pole in figure 109 and is based on the same type of non- 
disjunction. During anaphase the exceptional monad passes to one pole, and 
thus we get the two groups of thirteen and fourteen monads. 
116 A second spermatocyte telophase with thirteen monads at each pole. 
118 and 119 illustrate the precocious behavior of the unpaired supernumerary 
(S) in late prophase. This element, like the accessory, condenses more rapidly 
than the other chromosomes and thus appears smoother and less granular at 
this stage. 
450 
