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Parent generation = Tall plant TT x warf plant tt
TT x tt = Tt Tt Tt Tt = F1 generation; Phenotypic ratio = 1:1, genotypic ratio = 1:1
Tt x Tt = TT Tt Tt tt = F2 generation; Phenotypic ratio = 3 tall:1 dwarf, genotypic ratio = 1:2:1.