The general definition of a gene is some heredity that is passed on from a parent to an offspring. Scientifically speaking, the transfer involves a sequence of nucleotides that forms part of the chromosome. This sequence of nucleotides is a DNA.
Thus, the answer would be
A. a segment of DNA
Both are myelinated, however, the oligodendrocyte myelinates up to 40 axons and the schwann cells myelinates a section of one axon.
