42 



The Journal of Heredity 



NORMAL PANICLE AND FALSE WILD FORMS OF THE CARTON 784 VARIETY OF 



OATS 



It is not hard to distinguish the three types, the homozygous false wild form on the left, the 

 heterozygous false wild in the center, and the Garton 784 on the right. Heterozygous false wild 

 oats are intermediate between the other forms. They do not breed true to type, whereas the other 

 two forms do, and their progeny segregate into sativa-like, heterozygous false wild oats, and 

 homozygous false wild oats. (Fig. 22.) 



54 Victory, 163 heterozygous false 

 Victory, and 80 homozygous false 

 Victory plants. This ratio does not 

 agree very closely with monohybrid 

 expectation (P = 0.0256). In only 

 three out of one hundred trials would 

 divergencies as great as this be expected 

 solely due to chance. 



GARTON 784 



False wild oats were also observed 

 growing in a pure-line selection of 

 Garton 784 made at the Minnesota 

 University Farm, in 1915. Here, as in 

 Victory^ it was easy to distinguish the 

 three categories of plants on the basis 

 of awn development, pubescence, and 

 articulation. On the other hand, the 

 homozygous and heterozygous false 

 wild oats as well as the true Garton 

 784 had black seeds and side panicles 

 but were non-liguled forms. The 

 parent plants classed as homozygous 

 false wild Garton 784 and homozygous 



Garton 784 bred true to these types 

 respectively. The 16 parent plants 

 classed as heterozygous false wild 

 Garton 784 produced a total of 81 

 Garton 784, 122 heterozygous false 

 wild Garton 784, and 55 homozy- 

 gous false wild Garton 784 (P = 

 0.0498). Here again theory does 

 not agree very well with observation. 

 The segregation, however, is similar to 

 that obtained from the heterozygous 

 false Victory plants. Considering both 

 varieties together there were 135 culti- 

 vated, 285 heterozygous false, and 135 

 homozygous false forms. This is ob- 

 viously a 1:2:1 ratio (X2 = 0.4053; P = 

 close fit). Nilsson-Ehle (1911) and 

 others obtained similar segregation. 



AURORA 



Aurora is a pure line selection made 

 by Mr. C. W. Warburton of the United 

 States Department of Agriculture. It 

 has a short plump yellow seed and is 



