Drag the labels to the correct locations on the Punnett squares. (G is the symbol for the green-pod allele and g is the symbol for the yellow-pod allele.) You can use a label once, more than once, or not at all.

given, two alleles,

G for green pod allele and g for yellow pod allele

let, two homozygous plants crossed over, then,

GG × gg ; then it will give in F1 generation,

       g      g

 G   Gg    Gg

 G   Gg    Gg

so, in F1 generation, it will give heterozygous Gg.

in F2 generation, 2 Gg will give, Gg × Gg

       G      g

G   GG    Gg

g    Gg     gg

as usual, the result gives us,

genotypic ratio = 1:2:1   (GG {green}, Gg {green}, gg {yellow})

phenotypic ratio = 3:1   (3 green plant and 1 yellow plant).

the real answer is b. scintillation counter

youre right there are