Genotype is the genetic basis of the organism. The individual letter in Tt represents the allele of the plant height trait.
Alleles are the variant form of the gene present at the same loci of the chromosome that codes for the specific trait of the organisms.
Alleles can be dominant purebred, recessive purebred, or heterozygous for the trait. The alleles define the characters of the organisms.
Therefore, the option c. allele is depicted in the letter of Tt.
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