In pea plants the trait for tall stems is dominant over the trait for short stems. if two heterozygous tall plants are crossed, what percentage of the offspring would be expected to have thensame phentotype as the parents

75%

Explanation:

Tall stems are dominant over short stems. Let T represent tall and t represents short. The parents are Heterozygous tall plants, which means that their genotype would be Tt and their phenotype would be tall. In a Punnett square it would look like this:

T t

T TT Tt

t Tt tt

Notice that we have 3 possible genotype combinations. When the dominant allele T is present that means that the phenotype that will be expressed is the dominant trait. In this case we have the following genotype and phenotype:

TT Tall 1/4

Tt Tall 2/4

tt Short 1/4

The question is asking the chance the pffspring phenotype is the same as the parent specifically so we can see that 3/4 are tall.

3/4 = 75%