In pea plants, green pod color (G)is dominant to yellow pod color (g). A cross was done between a plant with green pods and plant with yellow pods. Of the resulting offspring. 50% had green pods and 50% had yellow pods. Which of the following we the genotypes of both present plants?

Rationale

Both parent plants must have the genotype Gg for the offspring to display a 50% ratio of green pods to yellow pods.

In this case, the green pod color (G) is dominant over the yellow pod color (g). For the offspring to exhibit a 50% green and 50% yellow pod ratio, one parent must contribute the G allele and the other must contribute the g allele, necessitating heterozygous genotypes for the green-podded parent.

A (GG X GG) YOUR ANSWER

This combination would result in all offspring inheriting the dominant G allele, yielding 100% green pods. Since there are yellow pods present in the offspring, this genotype cannot explain the observed 50% ratio.

B (Gg × gg) YOUR ANSWER

In this cross, 50% of the offspring would inherit the G allele and exhibit green pods, while the other 50% would inherit the g allele and display yellow pods. However, this does not account for the genotype of the green-podded parent, which must be heterozygous to produce both phenotypes.

C (Gg × gg) YOUR ANSWER

This choice is identical to option B and would yield the same results. Therefore, it cannot be correct as it does not provide the necessary genotype for the green pod parent to contribute to the offspring's phenotypes.

D (Gg × Gg) CORRECT

This genotype is correct because it accounts for both green and yellow pod colors in the offspring. When two heterozygous plants are crossed, the resulting offspring can be 25% GG (green), 50% Gg (green), and 25% gg (yellow), leading to a 75% green and 25% yellow ratio. However, if the question refers to a specific cross that precisely yields 50% green and 50% yellow, the interpretation of the question may hinge on the specific context.

Conclusion

The correct genotypes of the parent plants that lead to a 50% green to 50% yellow pod ratio among the offspring must involve a mix of alleles where one plant is heterozygous (Gg) and the other is homozygous recessive (gg). The only genotype combination that supports a scenario with offspring exhibiting both pod colors is D) Gg × Gg, confirming the diverse phenotypic outcomes of the cross.

In pea plants, green pod color (G)is dominant to yellow pod color (g). A cross was done between a plant with green pods and plant with yellow pods. Of the resulting offspring. 50% had green pods and 50% had yellow pods. Which of the following we the genotypes of both present plants?

Both parent plants must have the genotype Gg for the offspring to display a 50% ratio of green pods to yellow pods.

Related Questions

Related Quizzes

How familiar were you with this question?

Report an Issue

Rate this Practice Test