No. 611] 



ALLELOMORPHS 



697 



cided by the experiment made with Family 580 in 1913 

 (Table VI), since in this family there was noticed a con- 

 stant tendency toward the allelomorphic transformation 

 under consideration. 



TABLE VI 



1914 (h) . I 13» Sterile | 100 o \ 95 I 95.00% , +70.00% 2.92% 

 1916.... I 1202 i " i 1,436 99; 1.337! 93.11 +68^11 0^77 

 Total. ■ 1923 ' Ste rile 2.0^1 1.36 1.9 IS 93 17"/; +68.47 % 0.64% 



1 Derived from the family in 1913, i. e., Family U/80. 



2 Derived from the group (?>) in 1914. 



3 Excluding the group {a) in 1914. 



In Table VI there is beside the ca. 4 per cent, ex- 

 cess of recessives in the families derived from fertile 

 parents, a remarkable excess of recessives in the families 

 descended from the sterile parents in the group [h) in 

 1914. The sterile plant of this type could not be distin- 

 guished from those which, as was showTi in Table IV, 

 gave segregating families with an excess of dominants in 

 the intensity of the partial fertility as well as in the be- 

 havior of chlorophyll at the ripening of the seeds. Con- 

 sequently, it may be presumed that although these two 

 types of sterile plants have the same genetieal constitu- 

 tion originally, the dominant allelomorphs resulting from 

 the reversion of their recessive allelomorphs are of dif- 

 ferent stabilities in the dominant state; that is, in the first 

 type of sterile plants such dominant allelomorphs are 

 very easily re-transformed into the recessive state, while 

 in the second type the corresponding dominant allelo- 

 mor]-)hs tend to i-cniaiii in the reverted condition. 



