THE DETERMINATION OF SEX 

 CROSS 3 



GROSS. cf LAc-r.d 1 LACT.Q GROSS o 



(2) (3) (5) W) 



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 



(4) 



GROSS. 





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. 



