English: This figure outlines the process of dihybrid crosses between pea plants with homozygous dominant and homozygous recessive traits in the P generation. After the parents from the P generation cross with each other, they produce offspring with homozygous dominant traits for all the plants in the F1 generation, with a phenotypic ratio of 1:0:0:0. After the pea plants from the F1 generation cross with each other, they produce offspring with varying traits in the F2 generation, with a phenotypic ratio of 9:3:3:1.