VARIABILITY IK LINKAGE OF CHARACTERS OF MAIZE 
59 
Table 36. — Con-elation coefficients in all ears ichere male is heterozygous 
(progeny Dh J^16LSL1C5L8L1-1-R28) and where female is heterozygous 
{progeny Dh J,16L3LlG5L3Ll-I t -R2S) 
[Each coefficient (in italic type), if greater than 0.185 in the upper half of the table or if greater than 0. 210 
in the lower half of the table, exceeds three times its probable error] 
Designation of progeny 
and characters 
Num- 
ber of 
seeds 
Per- 
cent- 
age of 
white 
Per- 
cent- 
age of 
waxy 
Per- 
cent- 
age of 
cross- 
overs 
Ear 
length 
Base 
with- 
out 
Tip 
with- 
out 
seeds 
Num- 
ber of 
rows 
Date 
of pol- 
lina- 
tion 
Num- 
ber of 
seeds 
per 
centi- 
meter 
Mean 
weight 
of 
seeds 
Progeny Dh 416L3L1- 
C5L3Ll-l-R23(male 
heterozygous) : 
Number of seeds.. . 
Percentage of 
white 
Percentage of waxy. 
Percentage of 
crossovers 
Ear length 
Base without seeds. 
Tip without seeds. 
Number of rows... 
Date of pollination. 
Number of seeds 
per centimeter. .. 
Mean weight of 
Progeny Dh 416L3L1 
C5L3L1-4-R23 (fe- 
male heterozygous) : 
Number of seeds. .. 
Percentage of 
white 
Percentage of waxy. 
Percentage of 
crossovers 
Ear length 
Base without seeds. 
Tip without seeds. 
Number of rows . . . 
Date of pollina- 
tion 
Number of seeds 
per centimeter- .. 
Mean weight of 
seeds 
0.005 
.161 
.278 
.52', 
-.536 
-.135 
.551 
-.171 
.705 
-.026 
-.212 
0.005 
. 075 
~m 
.024 
.082 
. 004 
.089 
.026 
.063 
.156 
0.161 
.701 
. 042 
.220 
. 030 
.103 
.014 
107 
0.278 
-.085 
.042 
.042 
.024 
.089 
'III 
. 1GG 
.085 
, 004 
.035 
.113 
205 
0.527 
.125 
.220 
.162 
-~037 
.118 
.279 
-.104 
.009 
.278 
50 J; 
■0. 636 
.074 
.03 
020 
-.388 
-0. 135 
-.078 
-.103 
-.097 
.118 
.057 
-.339 
0.551 
-.078 
-.014 
.106 
.279 
-.143 
-.109 
-0. 171 
-.032 
-.063 
-.091 
-.104 
-.07 
.051 
-.126 
-.126 
.124 
-.036 
, 47 x 
, 020 
.113 
.004 
-.307 
.004 
-.189 
.145 
-.206 
-.121 
-.220 
0.705 
-.039 
-0. 026 
.194 
.107 
.002 
.278 
.026 
.033 
-.036 
-.220 
-.248 
-.2481... 
.156 
.093 
.113 
-.104 
-.381 
-.169 
.145 
-.042 
807 
-165 
-.232 
-.220 
-.205 
.191 
.147 
.073 
-.206 
-.049 
-.807 
Data from other progenies bearing on the relation of crossing over 
and the size of ear are rather meager, but the evidence is sufficient to 
indicate definitely that the relations shown in the larger progeny 
are not general. (Table 37.) Thus 17 reciprocals in Dh 416, Lan- 
ham, 1924, show a negative correlation of — 0.47±0.13 between cross- 
overs in the male and the number of seeds on the homozygous parent, 
and that between crossing over in the ovules and the number of seeds 
on the heterozygous parent is positive, 0.34±0.15. The data from 
the entire population substantiate the relation between crossing over 
in the ovules and the number of seeds, but the correlation between 
crossing over in the male and the number of seeds on the hetero- 
zygous parent, while negative, is insignificant, indicating that the 
restricted population of reciprocals was a chance deviation. Few of 
the coefficients in other progenies are significant, but the numbers 
are too small to detect correlations of the indicated magnitude. 
