60 BULLETIN 754, U. S. DEPARTMENT OF AGRICULTURE. 
TABLE XXVI.—Possible. effect of self-fertilizing a plant in which the color 
factor has become fractionated in such a way as to make the union of the 
gametes result in a colored zygote. 
[The percentage of white seeds is 39.06.] 
Gametes. CR. CR’, Cr’. Cr. cR. cR’. cre cr. 
CRigs ean Colored. .| Colored. -.| Colored. -.| Colored. .| Colored. -|} Colored. -} Colored - | Colored. 
CRA ase zat ee dor |F2d Ose Pe MOLE aNd Oe ee Ped Ose s-e 154: 00:5.. 4 | aed Ouaeee "Do. 
( eset eee ee domes ce Osea seetloes soe) ANAM 5) Clb seca eo lheesee|laoeOlOh 5-0 52 White. 
(Oa eee eee Ors eae eee CO secee= | eV Gels a |e Os saan ee OW oc slo GOne bey. White----||, Do: 
CRG e ee soe) ae do do Colored - - Colored. -| White White eC Wsceas+ Do 
CHU se eee ae doa do do =O <—- =) Owes. do doses Do 
CA ee ae dose do dozzeees White sas lMeed O2es2 = do dota Do 
Cree tases ester do does Wihites-e Eee do. Coz ease Gloysses eoe do.. Do 
The other aberrant ear, No. 1914, which is shown in figure 9, is a 
very close approximation of the 1 to 1 ratio, the deviation being but 
slightly in excess of two times the probable error. The deviation is 
also insignificant from the 56.25 per cent white expected on a 7 to 9 
ratio, while the expected ratio was 9 to 7 or 48.75 per cent white. 
Here again we may be dealing with a fractionation of the factor R 
in such a way perhaps that enough has been separated from the fac- 
tor R to occasionally prevent the normal color reaction with the 
Fed. /9/4 IGT SS LGH2, 
Fic. 9.—Diagram showing the relations of ears Nos. 1914, 1913, and 1912. 
factor C. (See Table XXVII.) If this assumption is made, the 
expected percentage of white seeds is 53.1, which is indeed a very 
close approximation to the observed 53 per cent. 
With the assumption that the plant which bore ear No. 1914 was 
of the type indicated in Table X XVII, such a plant if crossed with 
one heterozygous for the factor C and homozygous for the normal 
F factor would give an ear with the monohybrid ratio of white to 
colored seeds which fits the observed results, as is shown in figure 9. 
