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

In the $F_2$ generation of a dihybrid cross,how many types of genotypes are produced?

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.

In a cross performed between parents considering two contrasting characters yellow round and green wrinkled seeds. In the $F_2$ generation progeny,the ratio of yellow and green will be . . . . . . .

In a dihybrid cross,out of $16$ plants obtained in the $F_2$ generation,the number of distinct genotypes is:

In the $F_2$ generation of a dihybrid cross,what is the probability of a plant being homozygous for both dominant traits (in $/16$)?