The law of dihybrid cross proves which of the following?

In Mendel's dihybrid cross,how many types of offspring were obtained in the $F_2$ generation that were different from the parental types?

What is the genotypic ratio of the $F_2$ generation in Mendel's dihybrid cross?

In plants,red fruit $(R)$ is dominant over yellow fruit $(r)$ and tall height $(T)$ is dominant over dwarf height $(t)$. If a plant with genotype $RRTt$ is crossed with a plant with genotype $RRTt$,what will be the phenotype of the offspring?

The phenotypic ratio of a dihybrid test cross performed by Mendel is ....

State the Law of Independent Assortment and explain how it is derived.