Dihybrid Cross

Problem 11: Incomplete dominance in a dihybrid cross.

In Mendel's experiments, the spherical seed character (SS) is completely dominant over the dented seed character (ss). If the characters for height were incompletely dominant, such that TT are tall, Tt are intermediate and tt are short, what would be the phenotypes resulting from crossing a spherical-seeded, short (SStt) plant to a dented-seeded, tall (ssTT) plant?

A.
All the progeny would be spherical-seeded and tall.
B.
1/2 would be spherical-seeded and intermediate height; 1/2 would be spherical-seeded and tall.
C.
All the progeny would be spherical-seeded and short.
D.
You cannot predict the outcome.
E.
All the progeny would be spherical-seeded and intermediate height.


The Biology Project
University of Arizona
Tuesday, August 13, 1996
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