

342 MUTATIONS IN EYE-COLOR OF DROSOPHILA. 



Dark-eosin 9 by White-eosin <?. 



When the Dark-eosin females are mated to White-eosin males, all of the 

 offspring are Light-eosin. Thus: 



t^ i • i mu -i * I Light-eosin 9 489 



Dark-eosin 9 by White-eosm * { Light ^ sin & m 



The analysis is: 



VPoCX—VPoCX Dark-eosin 9 



VPocX — Vpoc White-eosin d" 



VPoCXVPocX Light-eosin 9 



VPoCXVpoc Light-eosin & 



Light-eosin 9 by White-eosin <?. 



When Light-eosin females are mated to White-eosin males, four classes of 



offspring result, as follows : 



Light-eosin 9 357 



, . , . . v Trn. A • , 1 White-eosin 9 370 



Light-eosin 9 by White-eosin c? 1 T . u , . „oet 



& J I Light-eosm <? 357 



fc White-eosin d" 344 



The analysis is: 



VPoCX— VPocX Light-eosin 9 



VPocX — Vpoc White-eosin d" 



VPoCXVPocX Light-eosin 9 



VPocX VPocX White-eosin 9 



« 



VPocX Vpoc Light-eosin <? 



VPocXVpoc White-eosin & 



White-eosin 9 by Light-eosin cf. 



When White-eosin females are mated to Light-eosin males all the female 

 offspring are Light-eosin and all the males White-eosin — a case of criss-cross 

 inheritance : 



Tin,- 4. • rs u t • i.x ! , J Light-eosin 9 365 



White-eosm 9 by Light-eosin * = ( w £ ite _ eosin # 3 32 



The analysis is: 



VPocX— VPocX 

 VPocX— Vpoc 



VPocXVPoCX Light-eosin 9 



VPocXVpoc White-eosin d" 



White 9 by White cf . 

 The only remaining possible combination in this series is that of white fema e 

 to white male of the eosin stock and vice-versa, which should give only white 

 females and males. This is in fact realized : 



White 9 by White d- = { JJ£ * fg| 



