NEW EYE COLOR MUTATION IN DROSOPHILA. 



47 



Fi FEMALE. 

 /XCv 

 \Xcv 



verm. 9 



F2 FEMALES. 



i MALE. 

 XCv 



XCv 

 XCv 



Xcv 

 XCv 



vermilion 9 



vermilion 9 



XCv 



verm, cf 

 F2 MALES. 

 vermilion <f 



Xcv 



cherry verm, 



The expectation is as many vermilion as cherry vermilion 

 males and the count shows this is exactly realized. 



CHERRY VERMILION BY PINK. 



When pink-eyed females were mated to cherry vermilion 

 males all the offspring, 381 in number, were red. These, when 

 inbred, should produce red, cherry, vermilion, pink, cherry 

 vermilion, cherry pink, vermilion pink and cherry vermilion pink 

 males. Because of difficulty of separation the male classes 

 vermilion pink, cherry pink, cherry vermilion, and cherry 

 vermilion pink were put into one general class. The females 

 were of two classes only, viz., red and pink. The following 

 analysis gives the expectation : 



red 9 330 



pink 9 79 



red cf 87 



cherry cf 40 



verm, cf 48 



pink cf 29 



cherry verm, cf . . . . 



cherry pink cf 



verm, pink cf 



cherry verm, pink cf 



The eight classes of males taken together number 430 as 

 compared with 409 red and pink females. The results may be 

 accounted for in the following way : 



p pink 9 XCVp XCVp 



cherry verm, cf XcvP P 



\ 



pink 9 X cherry verm, cf = 1 r gd cf / ' 



126 



Fi FEMALE. 



XCVp 

 XcvP 



red 9 



GAMETES of Fi 9 . 

 XcVp 

 XcVP 



GAMETES OF Fi cf . 

 XCVP 



Fi MALE. 

 XCVp 



XCVp 

 XCVP 



XCVp 



red cf 



XcvP XCvP 



Xcvp XCvp 



-p 



