5. A large set of data was analysed with the help of efficient statistical methods in order to see how many ratios were disturbed by linked genes for pollen tube competition. Indications of such competition have been found in connection with the following segregations:
| purple-1 and brittle-1 (see 6 below) | Brieger |
| deep and pale aleurone | " |
| yellow-white endosperm | Tidbury |
| deep-pale yellow endosperm | " |
| c and sh | Tseng. |