Sex-limited inheritance in Lychnis dioica L. 



281 



and narrow -leafed males, - - is also an important question for whose 

 answer there is at present no basis for a guess. 



(d) Crosses between heterozygous broad-leafed males and homozygous 



broad-leafed females. 



A cross between a heterozygote and a homozygote, when dominance 

 is complete, as it is in the case of the particular characters here in- 

 volved, is expected to give no result of special genetic interest. The 

 data from such matings in Table IV serve to complete the records of 

 the crosses made in the F 2 family under discussion, and emphasize 

 further the difference between the genetic behavior of the narrow-leafed 

 males and that of their broad -leafed male sibs, with respect to the 

 distribution of the sexes. In Table II it may be noted that the two 

 females (19) and (49) which were the mothers of all the families in- 

 cluded in Table IV, produced no female offspring when crossed with 

 narrow-leafed males, while Table IV shows that, when crossed with broad- 

 leafed sibs of those same narrow-leafed males, they produced practically 

 as many females as males. 



Table IV. 

 Formula: XBF . XBF X XBF . Xbf. 



*) This plant had leaves almost as narrow as those of angustifolia, but the hristle- 

 like rudiment of the ovary was only 1 mm long. Its genotypic character is not known. 

 Induktive Abstammungs- nnd Vererbungslehre. XII. 20 



