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.
A nerve doctor is called a neurologist. A neurologist who specializes in surgical care of nerve-related injuries is called a neurosurgeon. Neurology is a branch of medicine that studies the nerves, brain, nervous system and spine, according to the Johns Hopkins Medicine Health Library. Continue Reading.