Answer: Genotype
Step-by-step explanation:
The allele combination in an organism is known as the genotype which defines the characters of the organism.
The genotype of the organism also decides the genotype as well as the phenotype of the organism.
If The genotype of the organism is TT means it has two alleles who is dominant and will have a tall phenotype. Tt will have one allele as dominant and one as recessive and tt will have both the alleles as recessive and will be short height plant.