Question

A purebred talk pea plant is crossed with a purebred short pea plant. All of the resulting offspring are tall. What does this tell you about the gene controlling pea plant height?A. The short version of the gene wasn’t passed from the short parent to the offspring. B. The short version of the gene is dominant to the tall version of the gene. C. The tall version of the gene is dominant to the short version of the gene. D. The tall version of the gene wasn’t passed from the tall parent to the offspring.

Answer 1

Answer and Explanation:

We assume that the tall version has genes denoted by T, and short versions have genes denoted by t.  

Purebred tall version will have genotype TT, and short version, tt.

The Punnett square for the crossing between purebreds would be the following:

          T   T

t        Tt  Tt

t        Tt  Tt

Which means that the offsprings all have genotype Tt.  If they appear tall, this implies that the tall variety (T) is dominant, so the phenotype of the short version is not expressed.

Conclusion: The tall version of the gene is dominant to the short version of the gene.

Answer 2

The tall pea plant gene is dominant, and the short pea plant height is submissive. Each offspring has both genes, but since the tall gene is dominant, it is the only gene that shows up. Thus, option "C" is correct.

How, explain your answer?

From a heterozygous cross (Tt x Tt) the produced offspring would consist of:

25% TT -it would be tall-.

50% Tt -it would be tall as the gene T is dominant-.

25% tt -it would not be tall-.

Thus the produced offspring that would be tall is (50% + 25%) 75%. The answer is option C.

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