HEKEDITY 



The matter should be easy of determination 

 by observation of considerable numbers of Fj 

 and Fj offspring. Investigations are now in 

 progress to test this matter. 



My colleague, Dr. East, has found clear evi- 

 dence that, in maize, size-characters, although 

 they give a blending result in F^, nevertheless 

 give segregation in Fj. The character to be con- 

 sidered relates to length of ear in corn. A single 

 illustration will suffice. The variation in two 

 pure varieties is shown in the two upper rows of 

 Fig. 48. The " Length " of each class is given 

 in centimetres, its frequency just below at ' ' No. 

 Var., ' ' abbreviation for number of variates. The 

 variation in the F^ offspring obtained by cross- 

 ing the two pure varieties is shown in the third 

 row, and that of the F2 offspring in the lowest 

 row. Note that the variability in the F^ gen- 

 eration is not increased; its range is interme- 

 diate between the range in the parental varie- 

 ties. In the F2 generation, however, the varia- 

 bility is so increased that it includes almost 

 the entire range of both parental varieties, to- 

 gether with the intervening region. 



In the light of this evidence it is clear that 

 138 



