90 



HEREDITY AM) SKX 



GR9 GRS GWS YR$ YW & 



111 11 



These results are illustrated by means of Fig. 48, 

 in which the yellow color of the fly is indicated by 

 stippling the body and wings, and the red eyes by 

 black. The X chromosome is also marked and colored 



*2 



xx n x© X' 



Fig. 48. — Inheritance of yellow-white ($) arid gray-red (9) of Dro- 

 Bophila. In F x both sexes are gray-red. In F» are produced 4 GR 9 — 



i <;r $ — i aw $ — i yr $ — l yw S. 



