All of the plants in the F1 generation will be heterozygous tall (Tt). One plant will be homozygous tall (TT), two plants will be heterozygous tall (Tt), and one plant will be homozygous dwarf when the F1 plants self among themselves.
Since height and the colour purple are dominant traits, all F1 generation offspring will have a tall appearance and possess purple flowers.
The F1 generation, which only had purple flowers, was created by the cross-pollination of two parent (P) plants. Self-pollination of F1 plants produced the F2 generation, which had 75% purple flowers and 25% white blooms.
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