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

A. homozygous genotype

B. heterozygous genotype

C. homozygous phenotype

D. heterozygous phenotype

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.

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