IN AVENA CROSSES 6 

 TABLE VIII 



smooth, showing that this form has the pubescence factor 

 closely linked with the black color gene. 



The results as obtained from Series 687 so far as color 

 and pubescence are concerned may be explained in the fol- 

 lowing manner. We may assume the Avena fatua to be 

 represented by BBG-GYYPP, that is, possessing the fac- 

 tors black (B) which also produces pubescence, gray 

 (Gr), yellow (Y) and another factor (P) for pubescence. 

 The Sixty Day oat then may be bbggYYpp. We then 

 assume Y to inhibit the production of pubescence in the 

 absence of B or G. 



It may also be well to state that the results here found 

 can also be explained by assuming Y to have the effect 

 of producing pubescence in the presence of Gr. We 

 would then not assume any pubescence factor (P) for 

 this explanation. This assumption would account for 

 the results as well as the one chosen. On the other hand, 

 from data already obtained on other crosses it does not 



