IQII] SHU LL REVERSIBLE SEX-MUTANTS 351 



that ii of them appeared among progenies comprising a total 

 of 3331 females and 2126 hermaphrodites. In other words, they 

 constitute about o . 2 per cent of the total progeny of the genetic 

 hermaphrodites when the latter are used as pollen parents. In 

 no single family did more than one such male mutant occur. While 

 these numbers are too small to allow an accurate estimate of the 



(Mutant) 



83 84 



FIG. 13. Model pedigree for case XII 



relative frequency of hermaphrodite and male mutants, the evi- 

 dence seems to indicate that there is no striking difference between 

 the capacity of males to give rise to hermaphrodite mutants, and 

 that of hermaphrodites to give rise to male mutants, though 

 male mutants have appeared with slightly greater frequency than 



hermaphrodite mutants. 



CASE XIII 

 WHEN SOMATIC HERMAPHRODITES ARE CROSSED WITH UNRELATED FEMALES 



Pedigree no. 



08125 

 08132 



0995 . 



0996 . 



Total. 



Result 



39?:554 



569:26^ 

 632:34^ 



184?: 1334 



