600 CALVIN B. BRIDGES 



Since it makes no difference what male is used, I paired two 

 of the eight eosin females to white males and obtained: 



* "In addition to these six eosin females there appeared a female with a penis, 

 like that figured in "Heredity and sex." The eye color was eosin (w^ — w®), 

 It is possible that this was a three chromosomal form, or else caused by so- 

 matic non-disjunction. Neither gynandromorph would breed. 



I shall cite here several cases of non-disjunction which have 

 appeared in other experiments, and which show that although 

 the phenomenon is infrequent, it is wide-spread in diverse stocks 



* There appeared here one female with one eye white and one eye eosin. Her 

 offspring by a wild male were: 



red9(6) whitecMS) eosinc?'(2) eos. verm. cf(l) 

 119 46 39 18 



I had found females of this type before, but had not determined whether the 

 condition might be transmitted, so as#to appear in F2. Three pairs of Fi red 

 female by eosin vermilion brothers gave: 



wh.-eos. wh.-eos. 



red 9 comp. 9 pink 9 pink 9 whitecf redd^ verm.c? pinkcf verm, pink cf 

 63 50 14 14 69 30 20 10 3 



37 51 32 10 33 36 12 -7 2 



• 65 55 72 38 19 



In each of the first two bottles appeared a pink eyed female splotched with 

 white. One of these was sterile, and the other gave by a pink brother only 

 unsplotched pinks for three generations. 



F3 



Fe 



F6 



Mosaic forms can be explained by somatic non-disjunctions. 



