*Mendel and the Gene Idea homework help*?

Because the plant you have is long with axial flowers it has to have both the dominant alleles L and A. Therefore the possible phenotypes are LLAA, LlAa, LLAa, or LlAA. Crossing this plant with a full recessive (llaa) would be the test I would use. The possible results you can figure using a punnet square. If any of the offspring are recessive you know you have some hidden recessive alleles in the parent.