The plant height genotypes TT and Tt are similar in that both genotypes possess at least one dominant allele for plant height. This means that both genotypes will express the dominant trait of tallness. However, it is important to note that genotype Tt is heterozygous, meaning it contains both a dominant allele (T) and a recessive allele (t) for plant height, while genotype TT is homozygous, meaning it contains two dominant alleles for plant height.
