96 



MENDELISM 



CHAP. 



eyed cinn amon forms c orrespond ing to the various 

 green and yellow varieties. Cinnamon is recessive 

 and exhibits the same peculiar heredity. A point of 

 interest in connection with the Silky and Canary 

 cases is that in the course of the experimental work 

 occasional exceptions have been recorded to the 

 expectation demanded by the hypothesis. It is 



[9] Ffppli 



gives 

 gametes 



Fpi 

 fpl 



ffppH[c?J 



) 



gives 

 gametes 



/fpi 

 \fpi 



[rf]ffPPii [9]Ffppii 



ffppli [c?] 



gives 

 gametes 



fPi 

 fPi 



1) 



gives 

 gametes 



/Fpi 

 \fpi 



{Jives 

 gametes 



fpn 

 fpi / 



{ 



FfPPu[f ] 



gives 

 gametes 



FPi 

 fPp 



FfPpiJ ffPpii FfPpIi FfPpii ffPpIi ffPpii 



[?] [rf] [?] [?] IS] [<f] 



Fig. 25. 



Scheme to illustrate the heterozygous nature of the pure Brown Leghorn hen. 



For explanation see text. 



possible that in the heterozygous hen the character 

 factor and the sex factor do not always repel 

 one another, but until more data are forthcoming 

 the nature of these rare exceptions must remain 

 undecided. 



Apart fro m bird s^^di££eJs_on e other form in which 

 sex-ITmited inheritance of this particul ar type has 

 b een recorded. Tn t^g c<^mmnn rnrranf moth (j^braxas 

 grossulariatd) a paler variety {laciicolor) is known to 



