Question

a plant tt for tall height is crossed with a plant tt for short height. the offspring have the genotype tt. what is the phenotype of the plant?

Explanation:

Step1: Understand dominant - recessive concept

In genetics, if 'T' represents the allele for tall height and is dominant, and 't' represents the allele for short height and is recessive.

Step2: Determine phenotype

When an organism has the genotype Tt (heterozygous), the dominant allele 'T' will be expressed. So the plant will show the tall - height trait.

Answer:

Tall