WHEAT, OATS, BARLEY 9 



(whether pure or mixed in its heredity as to its 

 given factor), and thus to be able to select pure 

 types that would breed true; and, what is per- 

 haps equally important, to eliminate the impure 

 types that would not breed true. 



DOMINANT AND RECESSIVE CHARACTERS 



It will be of interest to note a few characters 

 that Professor Biffen particularly studied and 

 the groups into which they fall. 



As to characters that show the phenomena of 

 pure dominance and recessiveness, the following 

 among others were clearly revealed: Beardless 

 ears of grain are dominant to the bearded ears ; 

 keeled glumes to round glumes ; lax ears to com- 

 pact ears; red chaff to white chaff; red grain to 

 white grain; thick and hollow stem to thin and 

 solid stem; rough leaf surface to smooth leaf 

 surface; bristles on the stem to a smooth stem; 

 hard translucent endosperm (central grain sub- 

 stance) to soft opaque endosperm; and, finally, 

 susceptibility to the attacks of yellow rust was 

 dominant to immunity to yellow rust. 



This implies, as the reader is aware, that in 

 each case of those just listed, when two plants 

 represented by the opposite characters are 

 crossed, the offspring will show the first-named 

 character to the exclusion of the other in the first 



