928 
J ournaZ of Agricultural Be search 
Yol. XXX, No. 10 
Table XVII. —Distribution of F 2 plants for the characters black glume versus 
white and 2-rowed versus 6-rowed; cross SvanhalsXLion 
Two- 
Two- 
' 
rowed 
rowed 
Six- 
rowed 
black 
i 
Six- 
rowed 
white 
and 
inter¬ 
mediate 
and 
inter¬ 
mediate 
Total 
Year 
grown 
black 
white 
651 
222 
221 
60 
1,154 observed__ 
-1922 
649 
216 
216 
72 
1,153 calculated on 9 : 3 : 3 :1 basis.. 
X 2 =2.29. 
P=0.52. 
280 
80 
88 
32 
480 observed___ 
-j-1923 
270 
90 
90 
30 
480 calculated on 9 :3 :3 :1 basis_ 
X2=l.66. 
P=0.6504. 
Rough versus smooth awn and 
two-rowed versus six-rowed. —Since 
the data on the roughness of awn for 
the F 2 of the cross SvanhalsXLion 
grown in 1923 is close to calculated, it 
alone will be used in the discussion of 
correlated inheritance. The factors for 
2 -rowed and 6-rowed characters are 
independent of the factors for rough 
awn, intermediate-smooth awn, and 
smooth awn (Table XVIII). When 
the goodness of fit is calculated, the 
value of P is 0.2301. A deviation as 
large or larger than this would be ex¬ 
pected about once in four trials. 
Rough versus smooth awn, and 
BLACK VERSUS WHITE GLUMES. -The 
factors for black and white appear to 
be independent of the factors for rough¬ 
ness of the awn (Table XIX). A 
deviation as large as the one obtained 
would be expected in about half the 
trials. 
LINKAGE RELATIONS 
The results so far discussed show 
that the factors which differentiate 
deficiens, 2-rowed and 6-rowed, black 
versus white, rough versus smooth awn, 
and intermediate-smooth versus smooth 
Table XVIII.— Distribution of F 2 plants for the characters 2-rowed, 6-rowed, 
and rough awn, intermediate-smooth awn, smooth awn: cross SvanhalsXLion , 
1923 
Two-rowed 
Six-rowed 
Rough 
Inter¬ 
mediate- 
smooth 
Smooth Rough 
Inter¬ 
mediate- 
smooth 
Smooth 
276 
270 
60 33 86 
67.5 22.5 90 
;j J 
19 ; 
22.5 
! 
6 
7.5 
480 observed 
480 calculated. 
X 2 =6.89. 
P=0.2301. 
Total 
Table XIX.— Distribution of F 2 plants for the characters black glumes versus 
white and rough awn, intermediate-smooth awn, and smooth awn; cross Svanhals 
XLion, 1923 
Black glumes 
White glumes 
Inter¬ 
' i 
Inter i 
l 
Total 
Rough 
mediate- 
Smooth 
Rough 
mediate-! Smooth 
_: 
smooth 
smooth 
271 ! 
1 
60 ' 
28 ! 
91 
19 11 
480 observed. 
270 : 
67.5 ; 
22.5 
90 
22.5 ! 7.5 
480 calculated. 
X 2 =4.24. 
P=0.5178. 
