301 



I'.HIIAVIOR OF THE GENE FOK THE MTITAXT CUUVED OK DKOSO- 



PIIILA MELAXOGAKTEK IN ("ROSSES INVOLVING (JENES IN 



THE SAME ANI> OTIIKU ("I n{( >.\I<>S( ».M ES. 



KoscoK K. HviiK. 



Frum tlio Depart luciit of Iimimii()Ioi;y. ScIkiuI of Hyjiiciic aiitl I'liltlic 

 Healtli. Johns Hopkins Iiiivcrsily. Baltimore. 



Contents. 



I. Behavior of the curved win.ued mutant with normal w ild stock. 



1. Curvt^dQ by wild o'- ("hroniosonic 1. 



II. Jiehavior of curved with lieiit. Chi'omosome I\'. 



1. Curved 9 bj' bent cT. 



III. Behavior of curved with si)iiieless Chromosomi' III. 



1. Curved 9 by .spineless o\ 



2. Spineless 9 by curved d^. 



3. Deficiency of the double recessive, curved spineh ss in crowded 



cultures. 



I\'. Behavior of curved witli \-esti.i;ial. ("hromosome II. 



1. Vestigial 9 by curved o"". 



2. Curved 9 by vestigial cf . 



3. Back crosses between thi' hybrid of curved and \ < stigial t i 

 the parent stocks. 



V. Behavior of curved with crosses involvini: lilack. Chromosome II. 



1. Black 9 by curved cf . 



2. Curved 9 by black cf • 



3. Curved 9 by black, purple curved d". 



4. Black, purple curved cf by curved 9 . 



.'). (\osses involving black, purple, vestigial and cursed. 



VII. Literature. 



A winj: mutaticm in Hrosopliila uiehuioKaster wliich has proved to be iden- 

 tical with curved, a mutant found by Bridj^es in rudimentary stock, appeared 

 in my wild cultures in the latter part of November. 1914. The culture was one 

 of a large number of wild stocks that were taken during the fall of 1913 



