In di-hybrid cross, the ratio in F₂ generation is _____?

In a dihybrid cross (cross between two heterozygous traits, e.g., AaBb × AaBb), the F₂ generation shows a phenotypic ratio of 9:3:3:1. This represents: 9 with both dominant traits 3 with first dominant, second recessive 3 with first recessive, second dominant 1 with both recessive traits. This ratio demonstrates the independent assortment of genes according to Mendel’s law.