[Annals X. Y. Acad. Sea., Vol. XXII. pp. 113-133, pll. XVII-XIX, 23 July, 1912] 



SEX-LINKED INHERITANCE IN POULTRY 



By T. H. Morgan and H. D. Goodale 



(Presented before the Academy, S April, 1912) 



CONTENTS 



Page 



Introduction 113 



Crosses between Plymouth Rocks and Langshans 114 



Description of the breeds 114 



History of the breeds 115 



Source of breeding stock used 115 



Matings 115 



Explanation of the symbols used in interpreting the results 116 



Parental matings. 118 



¥ t matings 118 



Back matings 120 



Summary 121^ 



Description of F 1 Adult Plumage 121 



Shank color 123*. 



Booting 125' 



Down colors 121" 



Crosses between American Dominique females and Langshan males 128~ 



Parent generation 128 



F t generation from Langshan $ by Dominique $ 128 



F 2 generation 128 



Back cross of F t $ (barred) to Dominique 2 128 



Back cross of F a , black $ to Langshan $ 129 



Other features of the crosses 129 



White feathers in wings 130 



Color of legs 131 



Color of bill 131 



Theoretical considerations 131 



Bibliography 133 



Introduction 



In 1908, W. J. Spillman pointed out that, according to a breeder, 

 when Plymouth Rock females are bred to Langshan males all the females 

 are black and all the males are barred. As far as the evidence went, it 

 seemed to show, as he pointed out, that the case was comparable to that 

 of the moth, Abraxas, described by Doncaster and Raynor, and of certain 

 crosses among canaries described by Miss Durham. 



(113) 



