Question

What is the genotype for heterozygous Tall plants?
A. TT
B. Tt
C. tt
D. Tall

Answer 1

Heterozygous means that it is one dominant and one recessive gene, and since Tall is the dominant so it would be Tt. It is B. 

Answer 2

So,

The allele for tall is dominant, represented by T.  If a genotype is heterozygous, it has one allele each from the dominant and recessive alleles.  The recessive allele is represented by t.  So a tall plant with a heterozygous genotype has a genotype of Tt.

The correct option is B.