202 



Bulletin No. 155. — 1913. 



99 \ 



C2h2FfIi, white 

 C2BhFfIi, white 

 CiBbFfio, barred 

 [ C262F/0, black 



These data may be summarized as follows : 



From this it appears that among every 8 birds resulting from such a 

 cross as that being considered we should expect to have 4 whites and 

 4 darks. Of the white birds 2 would be d" d" and 2 99. Of the 

 dark birds 2 would be barred and 2 black, each group being equally 

 divided between the sexes. 



We may now compare with these data the results obtained in the 

 cross 325B X 325E presented on p. 177, and attempt to decide 

 regarding the actual zygotic constitution of 325E. The actual and 

 expected results were as follows : 



