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The offspring of a particular cross are 100 percent heterozygous for tallness. What were the most likely genotypes of the parents?

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If the offspring of a particular cross are 100 percent heterozygous for tallness, then the most likely genotypes of the parents are TT and tt. Let T be dominant allele and t be recessive allele. The genotypes will be: TT (dominant homozygote), Tt (heterozygote), and tt (recessive homozygote). If we cross a dominant and a recessive homozygote all of the offspring will be heterozygote: TT x tt = Tt, Tt, Tt, Tt.

The answer is D- TT x tt

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