342 



BOTANICAL GAZETTE 



[NOVEMBER 



CASE VI 



WHEN THE DAUGHTERS OF A SELF-FERTILIZED HERMAPHRODITE ARE CROSSED WITH 

 ONE OF THEIR HERMAPHRODITE SIBS 



(Mutant) 



?x 



Self 



The seed parents of these families were the same 14 females 

 which produced the families considered under case V. In the 

 present case they were all pollinated by a 

 single hermaphrodite, 08115(9), in the family 

 to which they themselves belonged. The 

 results correspond closely with those of the 

 last section, except that in this case the males 

 were invariably hermaphrodites, showing as 

 before that the character of the pollen parent 

 determines the sex character of the male 

 offspring. It may be noted that most of 

 these families contained a strikingly high per- 

 centage of females, as compared with those 

 under case V, there being 73.46 per cent of 

 females among the progenies of case VI, and 

 only 60.7 per cent among those of case V. 

 The meaning of such differences in the sex 

 ratios is quite unknown at the present time, 

 and no discussion of the series of experiments 

 which are in progress for the purpose of 

 finding an interpretation of such variable 

 ratios will be undertaken here. It is believed, however, that the 

 question of the sex-ratios constitutes an altogether different prob- 

 lem, and has no direct bearing upon matters relative to the genetic 

 interrelationships of the different sexual types, which are alone 

 under consideration in this paper. 



429 155 



FIG. 6. Model pedi- 

 gree for case VI. 



