The most likely explanation for the observation that round is dominant to wrinkled in Mendel's peas is
A) the round allele encodes a functional enzyme, the wrinkled allele encodes a defective enzyme, and the round trait could arise with only one functional gene for the enzyme.
B) the wrinkled allele encodes a functional enzyme, the round allele encodes a defective enzyme, and the wrinkled trait could arise with only one functional gene for the enzyme.
C) the wrinkled allele encodes a functional enzyme, the round allele encodes a defective enzyme, and the round trait could arise with only one functional gene for the enzyme.
D) the round allele poisons the wrinkled allele.
E) the round allele has an uppercase letter.

Question

Quizplus · Accepted Answer

The expression of the round phenotype is dominant to the wrinkled phenotype, suggesting that only one functional copy of the gene is necessary to produce the round trait. This is most likely due to the fact that the enzyme encoded by the round allele is functional, while the enzyme encoded by the wrinkled allele is defective.

The Most Likely Explanation for the Observation That Round Is