244 



M. R. IRWIN 



backcross bird carrying any one of these unit substances, when mated to a 

 Ring dove, has produced approximately equal proportions of progeny with, 

 and without, the particular substance in their blood cells. These substances 

 peculiar to Pearlneck, as compared with Ring dove, have been called d-1, 

 d-2, d-3, d-4, d-5, d-6, d-7, d-8, d-11, and d-12. Each of these is distinct from 

 the others (Irwin, 1939) both genetically and immunologically. Thus it ap- 

 pears that a gene or genes on each of ten of the thirty-odd pairs of chromo- 



TABLE 15.1 



ANTIGENIC RELATIONSHIPS OF THE BLOOD CELLS 



OF PEARLNECK, RING DOVES, AND 



THEIR HYBRIDS 



Immune Serum 



Pearlneck . 

 Pearlneck . 

 Pearlneck . 



Ring dove. 

 Ring dove. 

 Ring dove . 



Fi. 

 Fi. 

 F,. 

 Fi. 



Absorbed by 

 Cells of 



Ring dove 

 Fi 



Pearlneck 

 Fi 



Pearlneck 

 Ring dove 

 Pearlneck and 

 Ring dove 



Agglutination Titers 

 WITH Cells of 



Pearlneck 



23040 



11520 



90 



15360 

 

 



15360 







7680 







Ring Dove 



23040 

 

 



15360 



3840+ 

 180 



15360 

 3840+ 

 

 



23040 



11520 







15360 

 3840+ 

 



15360 

 3840+ 

 7680 

 360+ 



" -o ^'^ o"q a o 



.<>%»o • Pearlneck . <, o.-/ 



On a oQf, a n M /i 1% n ^ O O O O « O 



I 



A a. H.Q a a q q • 



I 



t\\ Pearlneck "aV-sfCs; 



Common 



Pearlneck 



Ringdove 



Common- 



Ringdove^ P'N. x R,D.-F, 



Hybrid 



Fig. 15.1 — Diagrammatic representation of the antigenic relationships of the Pearlneck, 



Ring dove, and their hybrids. 



