(2) Green yellow and green 3: 1

(3) Green and yellow 3: 1

Analysis: First of all, you should be clear that the pod is developed from the ovary wall of the pistil and has nothing to do with the fertilized egg. Therefore, the characteristics of pods produced by parent plants in the current generation depend on the maternal genotype. On the other hand, cotyledons are developed from fertilized eggs. Therefore, the cotyledon characteristics of contemporary seeds produced on the mother plant depend on the genotype of the offspring. That is to say, F2 segregation of cotyledon traits can be expressed on F 1 plants, while F2 segregation of pod traits can only be expressed on F2 plants.

I hope you can understand.