Gg Tt

Gg Tt gg TT

gg TT

gg Tt gg Tt

gg Tt

gt gt

Figure 13.12 A dihybrid cross between a green-podded, tall pea plant and a yellow-podded, dwarf pea plant. Green (G) and tall (T) are dominant; yellow (g) and dwarf (t) are recessive.

Genetics 247

Flowering Plants Examples

which a heterozygote is intermediate in phenotype to the two homozygotes. In snapdragons, for example, the F1 plants of a cross between a red-flowered parent and a white-flowered parent are all pink-flowered. When an F2 generation is produced from such a cross, the flowers of the offspring appear in a ratio of 1 red: 2 pink: 1 white (Fig. 13.13).

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