The genotype which is correctly labeled is TT and that is homozygous dominant.
Genotype may be defined as the ultimate combination of alleles of those genes which are significantly selected for specific studies.
It is clearly mentioned in the question that the tasting gene (T) is dominant to the non-tasting gene (t). Then, the genotype tT is heterozygous dominant, Tt is heterozygous dominant, tt is homozygous recessive, and TT is homozygous dominant. Hence, all forms of genotypes are mentioned appropriately.
Therefore, the genotype which is correctly labeled is TT and that is homozygous dominant.
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Your question seems incomplete. The most probable complete question is as follows:
In humans, the ability to taste the bitter chemical PTC is controlled by a single gene. The tasting gene (T) is dominant to the non-tasting gene (t).
Which of the following genotypes is correctly labeled?
