34 



INHERITANCE OF CHARACTERISTICS IN DOMESTIC FOWL. 



On account of imperfection of dominance decision as to gametic com- 

 position of any parent must largely rest on the make-up of the progeny. 

 Table 24 gives the most reasonable classification of the parentages. 



Table 24. 



DDXDD (SYNDACTYLXSYNDACTYL). 



Family 

 No. 



30 

 34 

 32 

 33 



Mother's 

 No. 



4569 



7528 



872 



5515 



Bred in 

 pen No. 



767 

 767 

 627 

 767 



Toes. 



Aba. 

 Abfi. 

 Abp. 

 Bba. 



Father's 

 No. 



5399 

 5399 

 5399 

 5399 



Bred in 

 pen No. 



747 

 747 

 747 

 747 



Toes. 



Aba. 

 Aba. 

 Aba. 

 Aba. 



Syndactyl. 



2t. 



2 



1 



12 



4 



Totals. 



19 



It. 



Ot. 





 



11 

 7 



18 



DDXDR. 



31 



30a 



33a 



32a 



34a 



36 



25a 



41 



37 



39 



40 



Normal. 



Aba 



Bba 



Abp.... 

 lAb^.... 

 Normal. 

 Ab^.... 

 Normal. 

 ...Do... 

 ...Do... 

 ...Do... 



4562 

 4562 

 4562 

 4562 

 4562 

 6399 

 3116 

 5399 

 5399 

 5399 

 5399 



767 

 767 

 767 

 767 

 767 

 747 

 D.Br. 

 747 

 747 

 747 

 747 



Normal . 



...Do... 



...Do... 



...Do... 



...Do... 



Aba 



Synd. . . 

 [Aba.... 

 lAba.... 

 lAba.... 

 ! Aba 



Totals. 



21 



14 



2 

 2 

 5 



12 

 7 

 3 



30 

 4 



18 

 5 

 9 



97 



DRXDR. 



38a 



35 



40a 



37a 



36a 



24 



26 



39a 



27 



29a 



29 



2Sa 



2526 



6861 



1892 



2831 



6869 



2526 



2104 



4570 



2831 



190 



767 



181 



658 

 767 

 658 

 658 

 767 

 658 

 608 

 767 

 668 

 520 

 190 

 513 



Normal. 

 ...Do... 

 ...Do... 

 ...Do... 

 ...Do... 

 ...Do... 

 ...Do... 

 ...Do... 

 ...Do... 

 ...Do.. 

 ...Do.. 

 ...Do... 



4562 

 4562 

 4562 

 4562 

 4562 

 3116 

 3116 

 4562 

 3116 

 3116 

 242 

 3116 



767 



767 



767 



767 



767 

 D.Br. 



Do. 



767 

 D.Br. 

 D.Br. 



513 



Do. 



Normal. 

 ...Do... 

 ...Do... 

 ...Do... 

 ...Do... 

 Synd. . . 

 ...Do... 

 ...Do... 

 ...Do... 

 ...Do.. 

 ...Do.. 

 . , .Do... 



TotaU 23 



2 



3 



3 



11 



4 



22 



18 



17 



32 



49 



28 



60 



249 



P. ct. 



100.0 



100.0 



59.3 



36.4 



74.2 



66.7 

 50.0 

 44.4 

 42.9 

 30.0 

 25.0 

 21.1 

 20.0 

 18.2 

 16.7 

 0.0 



26.5 



33.3 



25.0 



25.0 



21.4 



20.0 



18.5 



14.3 



10.5 



8.6 



7.6 



6.7 



3.2 



10.1 



Summarizing the foregoing, and comparing the totals with Mendelian 

 expectation, we get the result shown in table 25. 



A comparison of realization and expectation in table 25 shows that the 

 proportion of syndactyls is always less than expectation, not only for domi- 

 nants and heterozygotes together, but even for pure dominants alone. 

 The proportion of syndactyls obtained diminishes, to be sure, in accordance 

 with expectation (on the assumption that they are pure dominants), but 



