Which describes the notation Tt for the trait of being tall?

A. homozygous genotype

B. heterozygous genotype

C. homozygous phenotype

D. heterozygous phenotype

D. Heterozygous phenotype. Hetero means different. T and t are different, one is dominant the other submissive. Phenotype describe physical traits.

The answer is B. Heterozygous genotype.

The notation Tt shows a heterozygous genotype. A genotype shows the set of genes that it carries or was inherited. The capital letter represents a dominant trait and a lower case letter represents a recessive trait.

There are two ways to describe them; homozygous and heterozygous.

Heterozygous genotype has one dominant trait and one recessive trait. It looks just like what is given in your problem. Homozygous, on the other hand, has either a pair of the dominant trait or a pair of the recessive trait.

This is how they look like:

heterozygous: Tt

Homozygous: tt

Now phenotype is different. Phenotype is the trait that is physically expressed. The trait that will be expressed will depend on the genotype.

Genotype Phenotype

TT = homozygous tall

tt = short

Tt = heterozygous tall

Take note that the dominant trait is the trait that will physically manifest or physically be expressed.