The pi'oo-ress of Genetics since tbe rediscovery of Menders papers. 



395 



A B 



Fig. 16. A represents the unicolorous, nearly black, down of a chick of "Brown- 

 breasted" breed. This is dominant to B. bright brown, with a dark dorsal stripe on 

 a light ground. B is the characteristic down-colour of Brown Leghorn which closely 

 approaches Gallus baiikiva in colour. 



In the Silkworm yellow silk is usually dominant to white 

 silk, but instances to the contrary have been observed by 

 Cou tag- ne (41). 



In several animals self-coloured types have been shown to 

 be dominant to pied, e. g., self colour to Dutch-marking in 

 the Eabbit. There are however instances to the contrary 

 in the case of other pied animals. 



In plants no general rule can be declared. In Antir- 

 rhinum the bi- color forms "Delila" with a white tube are 

 recessive, but in Sweet Peas the bi-color type "Painted 

 Lady" with whitish wings, is dominant to other reds. 

 In Solanum, and Atropa the black fruit is dominant to the 

 yellow fruit, but in Bryonia the red fruit of dioica is 

 dominant to the black fruits of alba (Cor reus (35)) repeated 

 by B a t e s n and Punnet t). 



