SEX-LIMITED INHERITANCE IN POULTRY 



TABLE 7 

 Sex-dimorphic racial characteristics 



11 



CHARACTERS 



BROWN LEGHORN 



DARK BRAHMA 



A. Male (Figs. 1 and 2) 



2. Mating s and results 



The Fi generation. In 1910 I mated (Pen 1009) a Brown Leg- 

 horn cock- (No. 14123) to various Dark Brahma hens that had 

 been bred by me and were descended from Nos. 121 9 and 122 cf 

 described by me in a former pubUcation (Davenport, '06). The 

 following mothers produced offspring that grew to maturity so 

 that their permanent plumage could be described: Nos. 5835, 

 7549, 7859, 7869, 8001, 11160. Moreover, I mated in Pen 1015 

 a Dark Brahma cock (No. 11161) to a Brown Leghorn hen of the 

 same origin as the cock of Pen 1009. About fifty-four chicks 

 were reared from these two pens and their adult plumage color 

 studied. The distribution of plumage colors in the two sexes 

 and the two sets of experiments is set forth in table 8. 



Table 8 gives a definite answer to the question of the method 

 of inheritance of the characteristics considered. In the reciprocal 

 crosses of Pens 1009 and 1015 the 27 males are all alike; but the 

 fefnales differ according as the Brown Leghorn or the Dark 

 Brahma is used as father and in their hackle color they resemble, 

 in both cases, the father (figs. 5 and 6, 7 and 8). 



2 Bred by and purchased from H. W. Smith, Islip, Long Island, N. Y. 



