THE DETERMINATION OF SEX 283 



the color-blind determiner in simplex form, that is, in 

 a condition ineffective for producing color-blindness 

 in female individuals. 



All of the various possibilities in the inheritance of 



Barred Male 



Female 



Z 



Gametes 



Gametes 



Z Z 



Z O 



FIG. 88. Sex-linked inheritance, with the female heterozygous. 

 The "barred" character is indicated by underscored letters. 



color-blindness according to the sex-linked interpreta- 

 tion are indicated in the table on page 282. 



C. THE BARBED PLYMOUTH BOCK 



In animals in which the female is heterogametic 

 (Lepidoptera and birds) sex-linked characters are like- 



