Question

In garden peas, a single gene controls stem length. The recessive allele (t) produces short stems when homozygous. The dominant allele (T) produces long stems. A short-stemmed plant is crossed with a heterozygous long-stemmed plant. Which of the following represents the expected phenotypes of the offspring and the ratio in which they will occur_____________.

Answer 1

Answer: 1 long-stemmed plant : 1 short-stemmed plant

Explanation:

Homozygous recessive tt

Heterozygous dominant Tt

When a cross is made between two plants one is homozgous recessive for short stemmed plant and heterozygous dominant for long stemmed plant.

The cross will be  Tt       tt

                                   x

                           Tt  tt  tt  Tt

So, the result will be 2 long stemmed plants (Tt) and 2 short stemmed plants (tt). Hence, the ratio is one tall stemmed plant and one short stemmed plant.