48 
BULLETIN 1468, U. S. DEPARTMENT OF AGRICULTURE 
A third progeny bearing on the subject and grown at Arlington, 
Va., in 1924 is available. This progeny is related to the preceding 
two in having as one parent a line of Dh 416, but the other parent 
was an entirely unrelated sweet corn. Data from the pairs of ears 
testing a possible selective effect of upper and lower ears on the male 
gametes are shown in Table 30. There are 10 pairs with a mean 
weighted difference in the direction of a higher percentage of cross- 
overs when the pollen is applied to lower ears of 2.57±1.17. This 
difference is in the direction of that found in progeny Dh 
416L3L1C5L3L1R23, but though in the same direction it can not be 
considered significant. 
Table 30. — Grossing over in upper and lower ears where male and female 
gametes of progeny Ph 230L1 and L2R24 are measured 
Upper ears 
Lower ears 
Difference 
Plant designation 
Number 
of seeds 
Percentage 
of crossovers 
Number 
of seeds 
Percentage 
of crossovers 
(upper- 
lower) 
Male gametes measured: 
3X110 
462 
128 
708 
193 
265 
465 
547 
298 
394 
450 
18. 7il. 22 
43. 9±2. 96 
23. Oil. 07 
29. 6±2. 21 
25. 5±1. 81 
25. 5=fcl. 36 
26. 7±1. 27 
19. 2±1. 54 
27. 6±1. 52 
24. 0±1. 36 
319 
317 
190 
36 
274 
511 
282 
324 
407 
554 
24. 3il. 62 
38. 1±1. 84 
29. 5±2. 23 
27. 4i5. 00 
35. 6±1. 95 
24. 3±1. 28 
34. 3il. 90 
21. 6±1. 50 
20. 2±1. 34 
30. fcfcL 31 
-5.6i2.03 
5X200 
5. 8i2. 48 
6X103 
-6. 5i2.47 
15X126 
2. 2i5. 46 
23X169 
—10. Ii2. 66 
28X182 
• 1.2il.87 
510X616 
-7. 6i2. 29 
540X720 
-2. 4i2. 22 
548X603 
7. 4i2. 02 
16X157 
-6. lil. 89 
Mean 
-2. 57il. 17 
508 
66 
118 
69 
234 
332 
451 
60 
649 
260 
524 
344 
681 
379 
549 
396 
520 
398 
197 
538 
447 
596 
383 
321 
455 
165 
321 
669 
161 
611 
365 
371 
17. 6=bl. 14 
24. 6i3. 58 
18. 1±2. 90 
37. 8±3. 92 
21. 2± 1.80 
24. 5± 1.59 
11. 6± 1.01 
25. 4i3. 80 
14. 9± .94 
21. 5±1. 72 
17. 7il. 16 
26. 5±1. 60 
23. 6il. 10 
7.6i .92 
25. 2±1. 25 
15. 3±1. 22 
8.8i .84 
18. Odrl. 31 
13. 6il. 65 
18. 6il. 16 
19. 5±1. 26 
20. 5±1. 11 
14. 2±1. 20 
28. 1±1. 66 
23. 6±1. 34 
7. 6±1. 39 
16. 7±1. 40 
16. 7± .97 
21. 5±2. 18 
25. 6±1. 19 
16. 7±1. 32 
18. 4±1. 35 
265 
51 
320 
79 
76 
42 
125 
180 
450 
756 
140 
359 
135 
128 
335 
67 
277 
330 
523 
467 
411 
548 
443 
223 
148 
271 
124 
335 
286 
367 
318 
99 
18. 5il. 60 
20. 9±3. 82 
15. 7il. 36 
29. 2i3. 44 
17. 2±2. 92 
30. 5±4. 80 
31. 2±2. 80 
19. Oil. 97 
15. 2±1. 18 
25. 7±1. 05 
14. 9±2. 02 
21. Oil. 45 
19. 2±2. 28 
12. 5il. 97 
13. 5il. 26 
18. 0i3. 16 
10. Oil. 22 
19. 3il. 46 
18. 6il. 18 
16. 6il. 16 
25. 7il. 45 
19. 7il. 18 
11. 5il. 02 
33. 6±2. 60 
19. 5i2. 20 
15. 5il. 47 
12. 2il. 97 
15. 2i 1.32 
21. 2il. 63 
24. 3il. 50 
32. Oil. 76 
22. 0i2. 79 
Female gametes measured: 
602X514 
-.9il.96 
603X548 
3. 7±5. 23 
616X510.. 
2. 4i2. 77 
624X506 
8. 6i5. 22 
644X522 
4. 0i3. 42 
674X8C7 
—6. 0i5. 05 
677X519 . 
—19. 6i2. 97 
684X533 
6. 4i4. 29 
103X1 
-. 3il. 48 
117X1 
-4. 2i2. 02 
119X10 
2. 8i2. 32 
120X6 
5. 5i2. 16 
126X8 . 
4. 4i2. 53 
139X35 
-4. 9±2. 18- 
144X29 
11. 7i 1.77 
147X25 
-2. 7±3. 39 
149X13 
-l.2il.48 
157X16 
-.8il.97 
158X7 
-5. 0i2. 00 
163X28 
2. Oil. 62 
164X13 
-6. 2il. 92 
169X23 
.8il. 59 
178X26 
2. 7il. 57 
179X26 
-5. 5i2. 70 
184X33 
4. Ii2. 57 
187X33 
-7. 9i2. 03 
191X34 
4. 5i2. 42 
203X14 
1. 5il. 67 
213X3 
. 3i2. 71 
216X5 
1. 3il. 91 
222X1--. - 
-15. 3i2. 20 
210X3... 
-3. 6i2. 15 
Mean 
-. 43i . 67 
From this same progeny 32 pairs of ears are available showing 
the difference in rate of crossing over between the upper and lower 
ears when the female parent is heterozygous. Data from these ears 
