II 



Fig. 38. 

 Sex-linked inheritance of white eyes in D. melanogaster. A white- 

 eyed male is bred to a red-eyed female. The X-chromosome carry- 

 ing the gene for red eye is represented by the black rod; the X- 

 chromosome carrying the gene for white eyes is represented by 

 the open rod, and the white recessive gene carried in the chromo- 

 some, by small w. The Y-chromosome is stippled. 



