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

When Mendel self-hybridised the $F_{1}$ plants $(RrYy)$,he found that dominant and recessive traits of one character are segregated in a

When a tall plant with rounded seeds $(TTRR)$ is crossed with a dwarf plant with wrinkled seeds $(ttrr)$,the ${F_1}$ generation consists of tall plants with rounded seeds. How many types of gametes will an ${F_1}$ plant produce?

In a plant, tallness is dominant over dwarfness and red flower is dominant over white. Starting with the parents, work out a dihybrid cross. What is the standard dihybrid ratio? Do you think the values would deviate if the two genes in question are interacting with each other?

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 $/16$)

In the $F_2$ generation of a Mendelian dihybrid cross,how many plants homozygous for both the traits are found?