In Mendel's dihybrid cross,what is the ratio of offspring possessing homozygous dominant and homozygous recessive genotypes in the $F_2$ generation,which shows a phenotypic ratio of $9:3:3:1$?

In Mendel's experiment with garden peas,round seeds $(RR)$ were dominant over wrinkled seeds $(rr)$. Yellow cotyledons $(YY)$ were dominant over green cotyledons $(yy)$. What will be the phenotypic ratio of the $F_2$ generation produced by crossing $RRYY \times rryy$?

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.

Which of the following gametes are produced by an individual with genotype $RrYy$?

$A$ dihybrid condition is represented by:

If the cells of an organism heterozygous for two pairs of characters,$Aa$ and $Bb$,undergo meiosis,what will be the genotypes of the gametes produced?