The plant height genotypes TT and Tt are similar in that they both have at least one dominant allele (T) for the plant height trait. As a result, both genotypes will exhibit the dominant phenotype for plant height, which means they will be tall in this case. However, it is important to note that the genotype TT is homozygous dominant, meaning it carries two copies of the dominant allele, while the genotype Tt is heterozygous, meaning it carries one dominant allele and one recessive allele (t).
