Can someone please help with an intro Biology genetics question?

Peter

New member
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.
Suppose an individual from the F1 is crossed to an individual from line A. 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. Diagram the cross.

I have no idea how to diagram the cross can someone please help?
 
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