Crossing smooth-seeded pea plants with wrinkled-seeded pea plants resulted in progeny that all had smooth seeds. This indicates that the wrinkled-seed trait is
A) codominant and dominant.
B) recessive only.
C) codominant and recessive.
D) dominant only.
E) codominant only.

Question

Quizplus · Accepted Answer

The wrinkled-seed trait is recessive because it does not appear in the progeny when crossed with the dominant smooth-seed trait, indicating that the presence of the dominant allele for smooth seeds masks the expression of the recessive wrinkled-seed allele.

Crossing Smooth-Seeded Pea Plants with Wrinkled-Seeded Pea Plants Resulted in Progeny