Which of the following is heterozygous for two pairs of alleles?

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

During a dihybrid cross, in the $F_2$ generation, the ratio of individuals showing one dominant and the other recessive character will be . . . . . . of the total population. (in $/16$)

What type of gametes will be formed by the genotype $RrYy$?

In peas,tallness is dominant over dwarfness and red colour of flowers is dominant over the white colour. When a tall plant bearing red flowers was pollinated with a dwarf plant bearing white flowers,the different phenotypic groups were obtained in the progeny in numbers mentioned against them:
Tall,Red $= 138$
Tall,White $= 132$
Dwarf,Red $= 136$
Dwarf,White $= 128$
Mention the genotypes of the two parents and of the four offspring types.

What is the expected percentage of $F_2$ progeny with yellow and inflated pod in a dihybrid cross experiment involving pea plants with green-coloured,inflated pods and yellow-coloured,constricted pods (in $\%$)?