THE DETERMINATION OF SEX 



221 



Cross 3 



(2) 

 Gross d 



Gross, d* Lact. c? 

 (2) (3) 



(Ooioi) 



7(X ^ 6Z-' 



Lact. 5 Gross ^ 



(5) m 



Fig. 70. — Heterozygous grossulariata male crossed with lacticolor female. 

 One fourth of the progeny are lacticolor male, not known to occur in 

 nature. 



Cross 4 



GROSS d" tACT. ^ 



(2.^ (5) 



Fig. 71. — Back cross of lacticolor male with grossulariata female produc- 

 ing the original sex-limited condition in which all the females are of 

 the lacticolor type. Data for Figures 68-71 from Doncaster and 

 Raynor. 



