What is the expected percentage of F₂ progeny with a yellow and inflated pod in a dihybrid cross experiment involving pea plants with green-colored, inflated pod and yellow-colored, constricted pod? 

Let us denote the traits as follows:
G = Green pod colour (dominant)
g = Yellow pod colour (recessive)
I = Inflated pod shape (dominant)
i = Constricted pod shape (recessive)
Parent 1 (homozygous for green and infl ated pod): GGII
Parent 2 (homozygous for yellow and constricted pod): ggii
${\mathrm{F}}_1$ generation: GgIi
${\mathrm{F}}_2: {\mathrm{F}}_1\times {\mathrm{F}}_1$  (GgIi × GgIi)
${\mathrm{F}}_2$  phenotypic ratio: Green and infldated (9): Green and constricted (3): Yellow and inflated (3): Yellow and constricted (1)
Expected percentage of ${\mathrm{F}}_2$  progeny  with yellow and inflated is (3/16) × 100 = 18.75%