In the following crosses,write the characteristics of the progeny:

Cross	Progeny
$(a)$ $RR YY \times RR YY$ (Round,yellow $\times$ Round,yellow)	..........
$(b)$ $Rr Yy \times Rr Yy$ (Round,yellow $\times$ Round,yellow)	..........
$(c)$ $rr yy \times rr yy$ (Wrinkled,green $\times$ Wrinkled,green)	..........
$(d)$ $RR YY \times rr yy$ (Round,yellow $\times$ Wrinkled,green)	..........

$(a)$ Since both parents are homozygous dominant $(RR YY)$,all offspring will be $RR YY$,which are Round and Yellow.
$(b)$ This is a dihybrid cross of heterozygous parents $(Rr Yy)$. According to Mendel's law of independent assortment,the phenotypic ratio is $9:3:3:1$. The progeny will be: Round and Yellow,Round and Green,Wrinkled and Yellow,and Wrinkled and Green.
$(c)$ Since both parents are homozygous recessive $(rr yy)$,all offspring will be $rr yy$,which are Wrinkled and Green.
$(d)$ This is a cross between homozygous dominant and homozygous recessive parents. All offspring will be heterozygous $(Rr Yy)$,which are Round and Yellow.