I think the phenotype of a genotype tt (from the question) will show shortness which homozygous with two similar alleles for shortness trait. Therefore; since the t trait is recessive over the T allele which is dominant, Tt, -will be a tall pea plane, TT- tall (homozygous), tT- tall ( heterozygous), tt -short (homozygous).
DNA is genetic material in living organisms that is transferred from the parents. Cells and this DNA gives organisms personalized traits. Hope this helped !!
