In the case of the tall pea plant with the genotype tt, it’s important to clarify that this refers to a specific genetic makeup involving alleles. The lowercase ‘t’ represents a recessive allele for the trait of height in pea plants. On the other hand, when we refer to TT, we are speaking about a homozygous dominant genotype, which means this plant carries two dominant alleles for the tall trait.
To determine whether these two plants have the same genotype or phenotype, we first need to define both terms: the genotype is the genetic constitution of an organism, while the phenotype is the observable characteristics resulting from the genotype. In this case, the two plants have different genotypes: tt vs. TT. Therefore, they do not have the same genotype.
However, when it comes to their phenotype, both plants can still exhibit the same observable trait: being tall. In pea plants, the tall trait is dominant, meaning that any plant with at least one dominant allele (T) will be tall. Since TT is tall and the tt plants are not, it appears there was a misunderstanding. Indeed, a plant with genotype tt would actually be short. Therefore, the tall pea plant with genotype TT does not share the same genotype or phenotype with the plant tt.
In conclusion, a tall pea plant TT and a short pea plant tt have different genotypes and phenotypes.