A tall green gram plant was crossed with a dwarf plant. All the F1 plants were of intermediate height. The F2 plants produced different phenotypic classes (plant height) in the ratio of 1:4:6:4:1. How many genes are controlling the plant height? (JRF Plant Science 2021)

✅ Explanation: The 1:4:6:4:1 phenotypic ratio in the F2 generation is a classic indication of two genes controlling the trait (plant height in this case). This pattern suggests that the genes are interacting in an additive manner, with each dominant allele contributing to increased height.