GENES IN RELATED SPECIES 



103 



as in the case of D. melanogaster, and D. simulans, there 

 may always remain some doubt as to their identity, be- 

 cause similar mutant types that are not identical are 



62.0 -j-P 

 58.0 -|- gz 



42.0 --b 



03 



o.o N . 



50 



6 0' 



14.5 

 160 



:a 



V 



sn 



m 



240 -I- r 



36 

 420 



sc 



ro 



fu 

 CO 



n 

 s 



Cf 



ro 

 bx 



1 



St 

 Tm 

 Sb 

 gP 



M 





K 



V 



Ac 

 Ms 



D. obscura 



86 5 4- as 

 115 4 



10"] .0 4- S 



Fig. 61. 



Chart of the location of the mutant genes in the chromosomes of 

 Drosophila obscura. The loci corresponding with those of D. 

 melanogaster are sc=scute, y=yellow, No 2 =Notch, wh=:white. 

 (After Lancefield.) 



