No. 624] INHERITANCE OF UULL-LESSNESS 29 



tively more hull-less. The facts are the reverse. In the 

 series from the hulled kernels the hull-less plants are 

 in the majority and the opposite is true for the hulled 

 plants from the hull-less seed. It is very evident that 

 there is no relation between the kind of kernel (hulled 

 or hull-less) sown from a heterozygous plant and the oif- 

 spring produced. 



General Discussion 

 From the foregoing data it seems without doubt that 

 the inheritance of the hulled condition follows a simple 

 Mendelian ratio giving in general 1 hulled, 2 inter- 

 mediate, 1 hull-less. This is in accord with the results 

 obtained by Norton, Gaines, Zinn and Surface, and 

 others. 



In regard to the relation between the hulled condition 

 of the heterozygous parent plants and of the offspring, 

 it is clear that there is a very close agreement in regard 

 to the hulled percentage. When high or low plants are 

 selected they produce heterozygous offspring giving high 

 or low percentage. In most cases, howovcM*, the usual 

 1:2:1 ratio is obtained. This is true in ovn.M-al in all 

 cases of the 082 series but not so for 202. Wlu'tlicr the 

 202 series behaves differently or whether in reality it 

 will agree with 382 will have to be determined with 

 further work. 



The percentage relation shows that there is a variation 

 from very low to a very high percentage. Owing to this 

 fact and that any heterozygous plant tends to reproduce 

 a simple monohybrid ratio, in which the heterozygous 

 plants tend to follow the percentage relation, it seems at 

 first that we are dealing with a case of multiple factors, 

 in which one primary factor pair determines the hulled 

 or hull-less condition and the other factors influence the 

 hulled condition of those plants only that are hetero- 

 zygous for the primary factors. This nia\ ho so, as the 

 results of selecting high or low imlivichials seem to indi- 

 cate. If, however, we assume a multiple factor series to 



