Three strains of green-seeded lentil plants appear to have the same phenotype. The strains are designated G₁, G₂, and G₃. Each green-seeded strain is crossed to a pure-breeding yellow-seeded strain designated Y. The F₁ of each cross are yellow; however, self-fertilization of F₁ plants produces F₂ with different proportions of yellow- and green-seeded plants as shown below.

For each set of F₂ progeny, provide a genetic explanation for the yellow : green ratio. What are the genotypes of yellow and green F₂ lentil plants in the G₂ x Y cross? 

Verified step by step guidance

1. Identify the phenotypic ratio of the F2 generation for the G2 x Y cross, which is 7/16 green and 9/16 yellow.
2. Recognize that the 9:7 ratio in the F2 generation suggests a complementary gene interaction, where two genes are involved in determining the phenotype.
3. Assume that the green phenotype is due to the presence of at least one dominant allele at both loci (A-B-), while the yellow phenotype results from having at least one recessive allele at either locus (aaB-, A-bb, or aabb).
4. Determine the genotypes of the F1 generation, which are heterozygous for both genes (AaBb), as they are all yellow, indicating the presence of recessive alleles.
5. Conclude that the genotypes of the F2 green plants are A-B-, and the yellow plants are aaB-, A-bb, or aabb, based on the complementary gene interaction.