338 



MUTATIONS IN EYE-COLOR OF DROSOPHILA. 



Vermilion 9 

 by Pink <? 



721 

 Red 9 



Verm, c? 

 706 



\ 

 / 



Total 



B9 



63 

 102 



55 



56 



166 



127 



94 



173 



88 



96 



82 



53 



1,145 



Re? 



57 

 73 

 61 

 47 



158 

 96 

 72 



196 

 76 

 76 



114 

 75 



1,101 



79 



45 

 81 

 65 

 58 



166 



109 

 58 



173 

 91 



105 

 93 

 56 



1,100 



Ve? 



67 

 60 

 70 

 55 



135 

 76 

 75 



161 

 87 

 79 

 82 

 43 



990 



P9 



10 

 30 

 13 

 12 

 34 

 23 

 17 

 48 

 19 

 22 

 20 

 10 



222 



The reciprocal cross, Pink 9 by Vermilion d 1 , was also repeated as a safe- 

 guard, although nothing unusual had appeared before, and again the results are 

 regular as shown in the next table: 



Pink 9 by 

 Vermilion e? 



Red 9v 



RedcT 7 



Total 



1,034 



473 



JJ9 



| Re? 



V<? 



154 



78 



64 



147 



37 



76 



213 



78 



67 



154 



96 



80 



126 



65 



68 



215 



111 



87 



25 



8 



14 



456 



16 



9 

 35 

 32 

 31 

 45 



9 



167 





 3 



4 



13 

 17 



24 



8 



69 



8 

 11 

 15 

 14 

 11 

 21 



6 



86 



The following back-crosses were carried out. As the results were regular 

 in all cases no comment or analysis is called for: 



R 9 (from V 9 by P <?) by P <? 



R 9 (from P 9 by V e? ) by V e? 



R 9 (from P 9 by V e?) by P <? 



R <? (from P 9 by V e?) by V 9 



V e? (from V 9 by P <?) by P 9 



R 9 Re? V e? P 9 Ptf e? 



129 



99 



25 



R 9 

 424 



286 



60 



49 



117 



60 



R 9 R & 



106 



V 9 

 113 



8 



9 



8 



14 



453 



42 



V <? 

 83 



R 9 Re? P 9 P & V cT <? 



6 



R 9 Re? V 9 V <? P 9 P <? Oc? 



232 



10 



2 



209 



184 



6 



The expectation in the last cross calls only for Reds and Pinks 



The small 



additional classes must be due to a mutation in P 9 due to loss of P in som ^ 



eggs (or possibly to the presence of an orange 9 in the pinks) 



These small 



classes did not appear in one bottle that gave only Reds and Pinks 





