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Genetic Studies in Poultry 



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Fig. 6. Illustrating the alteration in the pature of the curve presented in Fig. 5 when the 

 Fj birds are supposed to be also heterozygous for a factor inhibiting the production of 

 pigment in the egg-shell. 



gave a bimodal curve (Fig. 3) we should look for a bimodal curve also 

 when such males are mated with Hamburgh % ? ; though we shall of 

 course expect both modes to be shifted in the direction of lower grade. 

 The curve actually obtained is shown in Fig. 7, and is certainly not 



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 Fig. 7. Distribution pf grades of egg-colour from F^ Hamburgh-Langshan 

 ^ jj X Hamburgh $ $ . 



