1. A lilly from a true-breeding line with white flowers and short corollas (line A) is crossed to a lilly from a true-breeding line with black flowers and long corollas (line B). The resulting offspring, the F1, are all red-flowered, with corollas of medium length.

i) (one point) Based on the information above, is it possible to determine how many loci involved in this cross?

Below are listed three scenarios. They are mutually incompatible, e.g., if one scenario is the case, the others are impossible.

Scenario 1: (one point) Suppose an individual from the F1 is crossed to an individual from line A. The resulting offspring are as follows: 50% white flowers and short corollas, 50% red flowers and medium corollas. What type of allelic interaction is this? How many loci