Types of genotype observed in a dihybrid cross are

$A$ cross between plants having $RRYY$ and $rryy$ composition will yield plants with

Explain the Law of Independent Assortment based on a dihybrid cross.

In Mendel's dihybrid cross,the number of genotypes and phenotypes obtained in the $F_2$ generation are $P$ and $Q$ respectively. Identify $P$ and $Q$.

$A$ human male produces sperms with the genotypes $AB, Ab, aB,$ and $ab$ pertaining to two diallelic characters in equal proportions. What is the corresponding genotype of this person?

What is the percentage of recessive gametes produced by $YyRr$ (in $\%$)?