How many types of gametes may be produced by genotype $D/d : E/e : F/f$?

Which of the following depicts Mendel's dihybrid phenotypic ratio?

Which one of the following crosses will have a $1:1:1:1$ ratio of progeny?

In plants,red color $(R)$ is dominant over yellow $(r)$ and tallness $(T)$ is dominant over dwarfness $(t)$. If a plant with genotype $RRTt$ is crossed with a plant with genotype $rrtt$,what will be the result?

When tall plants with red flowers were crossed with dwarf plants having white flowers,Mendel found the phenotypic ratio of the $F_2$ progeny to be:

Heterozygous round and yellow seeded pea plants were selfed and a total of $800$ seeds were collected. What is the total number of seeds with the first dominant trait (round) and the second recessive trait (green)?