THEORY OF EVOLUTION 4-9 



Vestigial 



f^ 



c 



D 



Long 



c 



D 



(DHmiD 



Gametes .xF, 



i c 



anmnD ^cgs 

 I 



c 



3 



(nn 



c 





cmrnTTD 



CTTTTTTTTD 



Fig. 19. Diagram illustrating a cross between a fly (Dro- 

 sophila ampelopliila) with long wings and a mutant fly with 

 vestigial wings. 



