Which traits did Mendel consider for his dihybrid cross experiment?

What is the genotype of the $F_1$ generation offspring obtained in a dihybrid cross?

Determine the number of possible gametes produced from an organism with the genotype $RrYy$.

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 dihybrid cross,what is the proportion of $RrYy$ offspring obtained from the selfing of an $RrYy$ plant (in $/16$)?

In Mendel's dihybrid cross,what is the proportion of the dominant homozygous plants in the $F_2$ generation (in $/16$)?