1gto] SHULL—INHERITANCE OF SEX IN LYCHNIS 121 
maintain that this is so, provided sex is inherited as a. Mendelian 
character. But if sex inheritance be not primarily Mendelian, but 
only associated with and perhaps determined by Mendelian charac- 
N 
Low 
~ 
produced by crossing heterozygous purple 
with white; broken curve represents ee both curves if monomodal belong to 
Pearson’s Type I. See constants in table IV. 
ters in a few cases, the determination of a sex ratio might not be a 
Process distinct from the inheritance of sex itself. 
The assumption that the sexes differ from each other by a single 
unit character, and that one sex is heterozygous and the other homo- 
