If allele t (long tongue) exhibits incomplete dominance over the recessive allele t (short tongue), a heterozygote for this gene would most likely have?

They would have T(long tongue)

Explanation:

Heterozygous: when the alleles for a genotype are different.

Incomplete dominance - an inheritance relationship that occurs when both alleles influence the phenotype

Recessive trait: characteristic factor will be masked in the presence of a dominant factor

i say that the answer is 'd'