"In a species of fern, there is a trait called branched dimorphism, in which the branches show two different patterns, as opposed to wild-type fern that only show one branching pattern. Two true-breeding parents, one single branching and the other with the dimorphic pattern, were crossed. All the F1 offspring displayed the single branching pattern. When the F1 plants were crossed, the F2 offspring were counted and it was found that there were 112 single branching offspring and 8 dimorphic branching offspring. How can you explain these results? "