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 are involved? Diagram the cross. What is the term for when one locus affects two or more traits? How many types of gametes can the F1 plants make
Scenario 2: (one point) Imagine instead that instead of the results above, the offspring are as follows....25% short corollas and white flowers, 25% short corollas and red flowers, 25% medium corollas and white flowers, 25% medium corollas and red flowers. How many loci would be involved in the cross? What sort of allelic interaction would it be? Diagram the cross. In this scenario, how many types of gametes can the F1 plants make
Scenario 3: (one point) Now imagine that the exact same cross is performed, and instead of the results above, the results are as follows; 45% short corollas and white flowers, 45% medium corollas and red flowers, 5% short corollas and red flowers, 5% medium corollas and white flowers. How many loci would be involved in the cross? What sort of allelic interaction would it be? Are the loci on the same chromosome? If so, which genotypes are recombinants? Diagram the cross.