We can observe a phenotype whether or not we understand the genetics behind it. In real life, there is a gene called HERC2 that works like I described, and most people with blue eyes have the broken allele of this gene.
Nerves, Neuroglia, and Ganglia. A nerve is a bundle of fibres (axons and/or dendrites) outside the CNS. Neuroglia are cells of the nervous system that help protect and support it. Ganglia are groups of nerve cell bodies lying outside the CNS.
Neuropathy, also referred to as neuralgia or neuritis, is a type of pain that involves the nerves. Neuropathy results from nerve degeneration, pressure, inflammation, or infection. There are several causes of neuropathy, including carpal tunnel syndrome, pinched nerves, spinal stenosis, and pressure from spinal discs.he sensory nerves send signals about what you feel, such as heat, cold, pain, and touch. Motor nerves in the sensory-somatic nervous system transmit signals about muscle movements. The autonomic nervous system controls involuntary body functions, such as blood pressure, heart rate, digestion, and body temperature.