In Mendel's dihybrid cross experiment,what was the phenotype of the $F_1$ generation that was self-pollinated?

Which law did Mendel propose based on his dihybrid cross experiment?

Describe the inheritance of two genes.

In a cross between yellow round $(YYRR)$ and pure breeding pea plants having green wrinkled $(yyrr)$ seeds,find out the total number of seeds (plants) having yellow colour in the $F_2$ generation out of $16$ offspring.

In a plant,gene '$A$' is responsible for tallness and '$a$' is the recessive allele for dwarfness. Gene '$B$' is responsible for red flower color and '$b$' is the recessive allele for white flower color. $A$ plant with genotype $AaBb$ (tall and red) is crossed with a plant with genotype $aaBb$ (dwarf and red). What is the percentage of dwarf-white flowered plants in the progeny (in $\%$)?

How many pairs of chromosomes are involved in Mendelian dihybrid crosses and dihybrid crosses with linkage,respectively?