| A, | violet-red flowers. | a, | white flowers. |
| B, | axis long. | b, | axis short. |
The form Ab was fertilised with ab, which produced the hybrid Aab. Furthermore, aB was also fertilised with ab, whence the hybrid aBb. In the second year, for further fertilisation, the hybrid Aab was used as seed parent, and hybrid aBb as pollen parent.
| Seed parent, Aab. | Pollen parent, aBb. |
| Possible egg cells, Abab. | Pollen cells, aBab. |
From the fertilisation between the possible egg and pollen cells four combinations should result, viz.:—
AaBb + aBb + Aab + ab.
From this it is perceived that, according to the above theory, in the third year of the experiment out of all the plants
Half
should
have
violet-red flowers (Aa),