In the garden peas used in Mendel's experiments, the spherical seed character (SS) is completely dominant over the wrinkled seed character (ss). If the characters for height were incompletely dominant, such that TT was tall, Tt was intermediate, and tt was short, what would have resulted from crossing a spherical-seeded, short (SStt) plant to a wrinkled-seeded, tall (ssTT) plant?
A) One-half would be smooth-seeded and intermediate height; one-half would be smooth-seeded and tall.
B) All the progeny would be smooth-seeded and tall.
C) All the progeny would be smooth-seeded and short.
D) All the progeny would be smooth-seeded and intermediate in height.
E) This cannot be answered without more information.

Question

Quizplus · Accepted Answer

The offspring will inherit one copy of the S allele for seed shape from the SStt parent and one copy of the T allele for height from the ssTT parent. Since the S allele is dominant and the offspring will inherit at least one copy, they will all have smooth-seeded appearance. For height, the heterozygous Tt offspring will exhibit an intermediate phenotype, resulting in all the progeny being smooth-seeded and intermediate in height (Tt).

In the Garden Peas Used in Mendel's Experiments, the Spherical