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. 



Summarizing the foregoing, and comparing the totals with Mendelian 

 expectation, we get the result shown in table 25. 



A comparison of reaUzation 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 



