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?

a. 3 long-stemmed plants: 1 short-stemmed plant

b. 1 long-stemmed plant: 1 short-stemmed plant

c. 1 long-stemmed plant : 3 short-stemmed plants

d. Long-stemmed plants only

e. Short-stemmed plants only

Question

Tristan Holder

Biology

8 March, 10:31

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?

a. 3 long-stemmed plants: 1 short-stemmed plant

b. 1 long-stemmed plant: 1 short-stemmed plant

c. 1 long-stemmed plant : 3 short-stemmed plants

d. Long-stemmed plants only

e. Short-stemmed plants only

+2

Answers (1)

Know the Answer?

Valentino Valdez · Answer 1

b. 1 long-stemmed plant: 1 short-stemmed plant

Explanation:

The short-stemmed plant would have genotype (tt) and the heterozygous long-stemmed plant would have the genotype (Tt). So when they will cross with each other half of the offspring will be long-stemmed plants and half will be short-stemmed plant.

T t

t Tt tt

t Tt tt

So the offspring which have Tt genotype will be tall and the offspring which have tt genotype will be short. Therefore the correct answer is b. 1 long-stemmed plant: 1 short-stemmed plant.