No. 566] INHERITANCE IN EARS OF MAIZE 105 



In the latter case only about 50 per cent, of the gametes 

 associated with self-red grains of homozygous, varie- 

 gated ears could be expected to carry S, just as in the 

 case of heterozygous ears. None of the open-pollinated 

 ears whose progenies I have grown were homozygous for 

 variegated pericarp, and none of the homozygous ears 

 that had been crossed with white contained any self red or 

 nearly self-red seeds. The only data, therefore, that bear 

 upon the point at issue are those obtained from self-pol- 

 linated, homozygous, variegated ears. The self-red and 

 nearly self -red seeds of such ears produced 64 red-eared 

 and only 25 variegated-eared plants, or about 72 per cent, 

 self-red. This may mean that in some cases both V 

 factors were changed to S factors, but the results may 

 just as likely be due to the presence of S in an unusually 

 large percentage of the male gametes concerned. The 

 production of the 25 variegated-eared plants, however, is 

 very good evidence that, in at least a very considerable 

 number of cases, not more than one of the two V factors 

 could have been changed to S. 



If the change from VtoS should happen to occur at such 

 a time that the grain rudiments became sectorial chimeras 

 consisting of say one half modified cells and one half un- 

 modified ones, one half of the pericarp would be expected 

 to show red color and the other half no color. It would 

 be expected further that the chances of a particular 

 gamete's arising from a modified or from an unmodified 

 cell would be equal. If then one half of the gametes asso- 

 ciated with these one-half-red grains arise from cells in 

 which only one of the V factors has been changed to S, 

 one fourth of the gametes should carry S and three 

 fourths should carry V, or one fourth S, one fourth V, and 

 one half — , depending upon whether the ears concerned 

 are homozygous or heterozygous for variegated pericarp. 

 Such grains from homozygous ears should, therefore, 

 whether selfed or crossed by white, yield about one red 

 ear to three variegated ones. Similarly, from hetero- 

 zygous ears, grains with one half their pericarp red should 



