No. 583] ROLE OF ENVIRONMENT IN DROSOPHILA 399 



cessive, hence, neither his female-producing nor his male- 

 producing sperm affect the dominant characters that the 

 eggs carry, and in consequence the entire F 2 count, fe- 

 males as well as males, are indicators of the gametic 

 composition of the eggs of the F x female. The F 2 results 

 are given in Table VII. 



The relation of the classes to each other is evident from 

 the following diagram (III) which represents (as before) 



the sex chromosomes of the F, female. The classes of 

 gametes of the Fi females are the following: 



