Duplicate genes for capsule-form in Bursa bursa-pastoris. _ 121 



Plants. 



Avena sativa (oats) : 



Black color of glumes (Nilsson-Ehle 1908, 1909) 



Presence of a ligula } 



. ,, (Nilsson-Ehle 1909) 



Paniculate inflorescence J v 



Hairiness of glumes (Nilsson-Ehle 1908, von Tschermak 1911) 



Length of glumes 



Number of flowers per spikelet 



Weight of grains 



(Nilsson-Ehle 1908) 



Height of stem 

 Width of leaves 

 Vegetative period, 



i.e., time of ripening (Nilsson-Ehle 1908, 1911b) 

 Beta vulgaris (beet): 

 Length of root 



Form of root , . . 



(Kaianus 1912 a) 1 ) 

 Yellow root -color 



Red root -color 

 Brassica napus (Swedish turnip): 



Red root-color (Kajanus 1912b) 1 ) 

 Brassica rapa (turnip): 



Length of root (Kajanus 1912^*) 

 Bursa bursa-pastoris (shepherds purse): 



Triangular form of capsule (Shull 1911a, 1914) 

 Cucurbita Pepo (gourd): 



Size of fruit > , 



, (Emerson 1910) 



Shape of fruit I 



Linum angustifolium 



Linum crepitans 



Linum usitatissimum (flax): 



Length of seeds (Tammes 1911, 1913, Johannsen 1913) 



Length of petals 



Width of petals , m 1nin In10 , 



, . \ (Tammes 1911, 1913) 



Color of flowers 



Dehiscence of capsules 



1 ) KAJANUS presented much data from the F 2 families in support of the view 

 that each of these characters is in certain cases independently produced by two or more 

 Mendelian genes. In a later study, however, (KAJANUS 1913) he entirely abandons 

 this interpretation. 



Induktive Abstammungs- und Vererbungslehre. XII. 9 



