PARNELL, AYYANGAR, RAMIAH, AND AYYANGAR 187 
Dark gold, GGit, x ripening gold,ggiz, gives an F, rather lighter 
than the dark gold parent. In F; an ordinary 3 : 1 ratio of dark gold : ripening. 
gold is obtained, as shown by the figures given below. The ripening golds are 
easily separable with absolute certainty. In the dark golds two groups can 
be distinguished since the heterozygotes are rather lighter in colour than 
the pure dark golds. A strictly accurate separation is not possible, however, 
as shown by the fact that of 112 plants described as dark 13 proved 
heterozygous, and of 117 medium 2 bred true. 
Table I gives figures for a number of families in which this separation 
was made and shows a near approximation to the expected 1: 2: / ratio. 
TABLE I. 
Segregation of Ggii. E 
Origin of parent Ref. No. es ee ace oo ue se gold 
1793 N 231 440 206 
1797 N 176 409 195 
Medium golds from : 
No. 1247 N a 1798 N 181 411 176 
1799 N 180 407 198 
\} 1800 N 218 463 232 
Miscellaneous oe 8 lots 1,658 3,372 1,674 
ToTaL a6 2,644 5,502 2,681 
* Calculated 1:2:1.. 2/07 s 5,413 g 2,707 
*N.B. All calculated ratios are given to the nearest whole number to avoid fractions. 
The following total figures were obtained by combining the families of 
Table I with others in which only the two main groups were separated :— 
Dark gold Ripening gold 
Gi i 
gi 
5 
29 families Sis ote 16,104 5,483 
Calculated 3 : 1 Bc 16,190 p 5,397 
Entirely similar results are given in the segregation of the type G g II 
where dark furrows replace gold. Here again three types can be distinguished 
in Fy, though in this case there is some uncertainty in separating the recessive 
group of ripening furrows from the medium furrows. hus of 21 plants 
assigned to the former group 1 proved heterozygous, whereas of 26 noted as 
medium 2 bred true to ripening furrows. 
