For all seven characters described in the data of Figure 2.5, Mendel allowed the F, plants to self-fertilize. He found that when F2 plants with recessive traits were crossed to each other, they always bred true. However, when F2 plants with dominant traits were crossed, some bred true but others did not. A summary of Mendel's results is shown here.
The Ratio of True-Breeding and Non-True-Breeding Parents of the F2 Generation

When considering the data in this table, keep in mind that it describes the characteristics of the F2, generation parents that had displayed a dominant phenotype. These data were deduced by analyzing the outcome of the F1 generation. Based on Mendel's laws, explain the 1:2 ratio obtained in these data.

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F, Parents Round Yellow Gray True-Breeding 193 166 36 29 40 Non-True-Breeding Ratio ooth Green Axial Tall TOTAL: 372 353 64 71 60 67 72 1059 :1.93 1:2.13 1:1.78 1:2.45 1:1.5 1:2.08 1:2.57 1:2.02 Sm 28 525