Tallness is a dominant trait and shortness is a recessive trait. if a person is homozygous for tall height then we can represent the allele as . if the person is homozygous for short height, we can represent the allele as. if a person is heterozygous then we will represent it as .

I'm pretty sure for this question, the answer wants TT for homozygous dominant. tt for homozygous recessive. Tt for heterozygous.

The trait is height of a person, tallness is dominant trait with allele T and recessive trait will be shortness with allele t.

If a person is homozygous for tall trait, then it means it has two alleles which are TT.

If a person is homozygous for shortness, then he has two alleles which are tt.

If a person is heterozygous, it means has two different types of alleles which are Tt.