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

In Duroc-Jersey hogs,skin color is determined by two pairs of alleles,$R/r$ and $S/s$. Any genotype containing at least one dominant $R$ allele and one dominant $S$ allele results in a red skin color. $A$ double recessive genotype $(rrss)$ results in a white skin color. All other genotypes result in a sandy skin color. If a Duroc-Jersey hog with the genotype $RrSs$ is crossed with a hog having the genotype $rrss$,what will be the phenotypic ratio of the offspring?

The genotypes of a plant variety were $TtHh, Tthh, ttHh$ and $tthh$,where $T =$ tallness and $H =$ hairy stem. Which one of the following crosses would produce progeny giving a phenotypic ratio approximately $1 : 1 : 1 : 1$?

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

Pure homozygous offspring in a dihybrid cross in the ${F_2}$ generation will be:

Mark the odd one (w.r.t. $F_{2}$ generation of Mendelian dihybrid cross).