THE DETERMINATION OF SEX 



211 



9 SOMA (Queen) ' 



ITARY t^ 



SPERMATOCYTE 



SPERMATOCYTE 



EGG 



FIG. 63. Diagram of the heredity of sex in bees, ants and wasps. The 

 outline chromosomes represent sample somatic chromosomes. The 

 solid black chromosomes stand for sex. The female has two sex 

 chromosomes while the male has but one. 



the opposite sex to develop to a certain degree in 

 their stead. This indicates that the determiners for 

 sex are intimately associated with those for the sec- 



