14. Effect of Dt on Pvv. Plants heterozygous for Dt and carrying the variegation allele for pericarp color were backcrossed by dt p individuals. The F1 seed was classified into Dt and dt classes and the ensuing ears graded for variegation in a way similar to that employed by Emerson in his studies on variegation. The data are as follows:
| Dt seed | dt seed | |||
| Number ears |
Mean variegation grade |
Number ears |
Mean variegation grade |
|
| 23 | 4.09 | 34 | 4.12 | |
| 22 | 4.09 | 19 | 4.05 | |
| 22 | 3.82 | 31 | 3.87 | |
| 17 | 4.18 | 11 | 4.36 | |
| 32 | 4.06 | 35 | 4.00 | |
| 30 | 3.67 | 68 | 3.68 | |
| 21 | 4.67 | 28 | 4.68 | |
| Total | 167 | 196 | ||
| Mean | 4.08 | 4.11 | ||
These data show there is no effect of the Dt allele on the unstable pericarp gene.