SIMILAR EFFECTS 113 



Parents Hybrids' Progeny 



y^ -V 



323 70 30 



It will be seen that the blacks are about three times as 

 many as the greys and w^hites together and the greys 

 about three times as many as the whites. Thus, we 

 have the following two-pair set : 



But the same white variety was mated with still 

 another black, with the result that still another pair 

 of factors w^as disclosed. The nature of the hybrids is 

 not mentioned, but four of them were bred from, and 

 their progeny were as follows : 



Parents Hybrids Progeny Ratio 



Black 



Grey and 

 White 



0353 X 0668 a 207 12 17-3 : 1 



b 116 7 16-6 : 1 



C 191 13 14-7 : 1 



d 116 8 14-5 : 1 



H 



