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.
Degenerative disc disease causes pain resulting from damage to the discs in your back and can occur from injury or naturally from aging.