No. 604] 



LINKAGE IX MAIZE 



229 



that crossing over occurred about twenty per cent, of the 

 time. 



TABLE II 



Showing the F, Distribution when F, Plants HETEROZY(,n . ki : /. \mi 



When plants that were heterozygous for G and for 

 both R and C were selfed, the ratio between the four 

 classes in the next generation appeared rather unusual. 

 This was found to be due to the influence of the 9 : 7 ratio 

 in aleurone color of each of the four plants that were 

 selfed (total, 477 purple: 387 colorless). The data from 

 such plants are arranged in Table III, which follows : 



TABLE III 



Showing F, Distribution when Pi.wts Tri/n iHizvciors Fm: a, E and C 



Tlicre is considerable deviation from the tluHircticnl ex- 

 pectancy in this case and the value for P is small 

 (P^.0808). Nevertheless, those results, taken in con- 



