346 E. J. ALLEN AND E. W. SEXTON. 
2. Matings giving No-white offspring of 2 kinds in the proportion 3: 1. 
Number of young. 
Red no-whites. Albino no-whites. 
RN+AN x RN+AN Experiment 373 125 
Theory 373 125 
3. Matings giving No-white offspring of 2 kinds in the proportion 1: 1. 
Number of young. 
Black no-whites. Red no-whites. 
BN+RxRN Experiment 47 42 
Theory At dt 
Red. Albino. 
RN-+AN xAN+R Experiment 14 10 
Theory 12 12 
4. Matings of normal-eyed animals carrying the factor for No-white, 
the offspring of crosses between normal-eyed and no-whites. 
(a) Those which give normal and no-white eyes of one colour in the 
proportion of 3 normal to 1 no-white, 1.e. 3: L. 
Black. Shee ee oe Black no-whites. 
B+NxB+N Experiment 24 i 
Theory 23 8 
Red. Red, Red no-whites. 
R-+Nx R+N Experiment 440 149 
Theory 44] 147 
Albino. Albino, Albino no-whites. 
A-+R-+NxA+R--N Experiment 45 10 
Theory 41 I4 
A+NxA+N Experiment 246 72 
Theory 238 (i) 
(b) Those which give normal and no-white eyes in two colours in the 
proportions 9:3:3: 1. 
Normal Red Normal Colourless 
R+A+NxR+A+4N Red. No-white. Albino. See 
Experiment 473 149 147 51 
Theory 461 153 153 51 
, Daal Tears > 
(BAR ENXBiR+N “Ra! yoni ag nel! APO 
Experiment 73 24 18 6 
Theory 67 23 23 ie 
Note.—This is the K family VII, referred to on p. 326 in which the 
No-white mutation arose independently. | 
