"is(are) mainly composed of nerve fibers with fatty coverings."

Myelin Sheath Fibers is a different fiber deliver impulses from the skin, skeletal muscles, and joints to the CNS. Afferent Division Sensory Division. consists of nerve fibers that convey impulses to the Nervous System from Sensory Receptors. Fatty insulating covering around nerve fibers. In CNS, made of Oligodendrocytes. While Somatic Sensory

"1. it should be, it has been for about 20 years, and it's really not much different in the end than breeding animals to have particular traits. there are always concerns about genetically engineered animals/plants affecting the environment in unexpected negative ways, but i can't think of an example where the fears didn't turn out to be baseless.  

first, as you point out, it would be a great advance in pharmacology, to be able to tailor drugs and their doses to me. the pros involve better medical treatment. the cons involve privacy issues like insurance companies denying coverage to people with genetic risk factors. looking at dna markers wouldn't affect the frequency of genetic diseases, but it would allow detection of them earlier. and ok, actually i suppose that if people used this information to avoid having children with genetic diseases, some might decrease in frequency."

both male and female gametes are produced by meiosis of the germ cells. therefore, both male and female gametes are haploid. one male and one female gamete unite during the fertilization to form the diploid zygote. in seed bearing plants, pollen grain is the male gametophyte, which produces sperm cells.