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.
Cervical degenerative disc disease (in your neck) is the second most common form of DDD. As with the lumbar form of the condition, degeneration symptoms in your cervical spine typically center on chronic pain that flares up significantly from time to time.ypes of Degenerative Disc Disease. Degenerative disc disease (DDD) can produce damaging change in your neck (cervical spine), middle of your back (thoracic spine) or your lower back area (lumbar spine). The problems you have will depend, in part, on the type of DDD you experience.