Duplicate genes for capsule-form in Bursa bursa-pastoris. 123 



Resistance to cold. 



i. e. winteriug-capacity (Nilssou-Elile 1908, 1911b) 

 Vegfetative period, 



i. e. time of ripening- (Nilsson-Ehle 1911b) 

 Zea Mays (maize): — 



Yellow endosperms (East 1910, East and Hayes 1911) 



Blue aleuronc (East and Hayes 1911, East 1912) 



Red pericarp (East and Hayes 1911, Emerson and East 1913) 



Dent vs. flint endosperms (East and Hayes 1911) 



Size of grains (Emerson 1910) 



Breadth of grains (Emerson and East 1913) 



Weight of grains (East 1911, Emerson and East 1913) 



Number of rows on the ear (East 1910, 1911, ShulF) 1910, 1911b, 



East and Hayes 1911, Emerson and East 1913) 

 Length of ears (East and Hayes 1911, East 1911, Emerson 



and East 1913) 

 Diameter of ears (Emerson and East 1913) 

 Height of stalks (Emerson 1910, 1911, East and Hayes 1911, 



Emerson and East 1913) 

 Numlier of stalks 

 Total length of stalks 

 Number of nodes per stalk 

 Length of internodes 

 Vegetative period, i. e. time of 

 flowering or ripening 



(Emerson and East 1913) 



Animals. 



Anas (duck): — 



Body-weight (Phillips 1912) 

 Oallus (domestic fowl): — 



Fecundity (Pearl 1912) 

 Homo sapiens (man): — 



Skin-color (Davenport 1910, 1914, Lang 1911) 

 Lepus (rabbit):— 



Ear-length (data of Castle) (Lang 1910, Walter 1913) 



Size of body (data of Mac Dowell) (East 1912) 



') I did not interpret the increased F, variability in the number of rows as due 

 to the segregation of plural determiners for row-number, but as the result of segregation 

 of Mendelian characters iageneral, resulting in different degrees of heterozygosis and 

 consequently in different degrees of heterozygotic stimulation. See text. 



9* 



