This is called a monohybrid experiment. A test cross is performed between two plants that breed true for one trait, and the resulting trait for each offspring plant is determined The first, true-breeding generation, is called the parent, P generation.
Lumbar Degenerative Disc Disease Video. The natural history of lumbar degenerative disc disease is relatively benign. The pain tends to be intermittent, and although at times the pain may seem to be getting worse, the painful symptoms are generally not progressive. While the disc degeneration will progress, the low back pain and other symptoms do not tend to get worse with the progression of the degeneration.
What You Should Know About Cervical Degenerative Disc Disease. Degeneration of the discs particularly in the moving sections of the spine like the cervical and lumbar levels is a natural process of aging.. When this aging process occurs more rapidly or prematurely it is considered degeneration.