442 T. H. MORGAN AND C. B. BRIDGES 



PINK 



The next series of experiments test the abiUty of various fac- 

 tors to produce dilution in the pink. 



Pink heterozygous for vermilion 



When pink females are mated to vermilion pink males, the 

 heterozygous Fi daughters are indistinguishable from pink stock 

 females : 



pink 9 XVp — XVp 

 ' verm, pinkcf X v p p 



Fi female Fi male 



XVp XVp 



X V p p 



pink 9 pinkcf 

 1264 976 



The reciprocal cross likewise gives pink females heterozygous 

 for vermilion and these are standard pink as before : 



verm, pink 9 Xvp — Xvp 

 ^' pinkcf XVp p 



Fi female Fi male 



Xvp Xvp 



XVp p 



pink 9 vermilion pink c? 

 969 941 



Pink heterozygous for eosin 



When pink females are mated to eosin pink males the daughters 

 are pink heterozygous for eosin. The eosin pink stock was ob- 

 tained by mating eosin females to pink males and extracting in 

 F2: 



pink 9 XWp— XWp 

 * eosin pink c? X w® p — p 



