Dec. 6,1915 
Inheritance of Length of Pod in Certain Crosses 
419 
Table XI .—Comparison of the pod lengths of third-generation parents with those of 
their long-podded progeny 
Parentage. 
€ 
Pod 
length 
of 
parent. 
Average 
pod length 
of 
progeny 
(long- 
podded). 
Difference 
from parent. 
Parentage. 
Pod 
length 
of 
parent. 
Average 
pod length 
of 
progeny 
(long- 
podded). 
Difference 
from parent. 
Mm. 
Mm. 
Mm. 
Mm. 
LV-486-35.. 
9 2 
89 
“ 3 
LV-91-16. .. 
104 
99 
- 5 
LV-92-2 .... 
81 
9 1 
+ 10 
VL-85-15. . . 
105 
104 
— 1 
LV-92-6. ... 
87 
89 
+ 2 
VL-480-6. . . 
105 
107 
+ 2 
LV-92-35 . . . 
93 
87 
- 6 
VI^ 5 I 5 “ 2 i.. 
98 
105 
+ 7 
LV-92-4O . . . 
96 
88 
- 8 
VL-515-22. . 
99 
i °5 
+ 6 
VI^2i6-i. . . 
96 
9 i 
- 5 
VU-515-23. . 
IOI 
106 
+ 5 
EV-558-17. . 
87 
93 
+ 6 
vL-515-35 • • 
103 
108 
4 * 5 
UV-558-24. . 
94 
93 
— 1 
vL-515-1 ... 
105 
108 
+ 3 
LV-558-9. .. 
94 
93 
— 1 
VL-515-27. . 
105 
109 
4 - 4 
LV-S 5 &-I 3 .. 
95 
92 
” 3 
VI^ 5 i 5 ~ 3 i. . 
108 
107 
— 1 
LV-558-H.. 
98 
94 
- 4 
VL-297-23. . 
98 
109 
+11 
LV-569-22 . . 
93 
92 
— 1 
VU-297-19. . 
99 
109 
+10 
LV-569-4O. . 
93 
95 
+ 2 
VL-297-5. .. 
107 
109 
4- 2 
LV-569-6 . . . 
96 
92 
- 4 
VL^297-ii .. 
121 
109 
—12 
LV- 569-23 . . 
100 
96 
- 4 
LV- 9 I -4 - 
102 
102 
0 
Average .. 
+0.5 
To sum up, the fourth-generation families show either that selection 
for long pod had been effective in isolating plants homozygous for 
minor factors or that segregation of the residual minor factors was in 
most cases masked by the modifications. 
SUMMARY 
(1) A single genetic difference, E , is responsible for the main differ¬ 
ence between short and long pods. This genetic difference segregates 
in normal Mendelian fashion. 
(2) Factor E is completely quantitatively dominant, so that E 2 = Ee . 
(3) This factor acts as a multiplier, with a multiplying value of about 
i.Si. 
(4) Minor factors for pod length also act as multipliers, with a com¬ 
bined multiplying value (when double) of about 1.42. 
(5) These minor factors apparently show zero dominance, in the sense 
that if A 2 B 2 C 2 .are positive double factors with a combined 
multiplying value of x , the value of AaBbCc .is V x . 
LITERATURE CITED 
(1) Bateson, William. 
1909. Mendel’s Principles of Heredity. 396 p., illus. Cambridge, [Eng.]. 
Bibliography, p. 369-384; supplementary list, p. 385. 
(2) Belling, John. 
1912. Second generation of the cross between Velvet and Lyon beans. In Fla. 
Agr. Exp. Sta. Ann. Rpt. [1910]/! 1, p, lxxxii-civ, fig. 15-31. 
