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Homozygous tall, red-flowered plant genotype: TTRR
Homozygous dwarf, white-flowered plant genotype: ttrr
Cross:
TTRR x ttrr
Gametes: TR x tr
F₁ : TtRr
Genotype: TtRr  Phenotype: Tall, red-flowered
 
Selfing:
TrRr x TtRr
Gametes: TR tR Tr tr  x  TR tR Tr tr
Punett's square:
TR   TTRR  TtRR  TTRr  TtRr
tR    TtRR   ttRR    TtRr   ttRr
Tr    TTRr    TtRr    TTrr   Ttrr
tr     TtRr     ttRr      Ttrr    ttrr
         TR        tR       Tr       tr          

Phenotypic Ratio: TallRed : DwarfRed: TallWhite: Dwarf White = 9 : 3 : 3 : 1

Hope this helps
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