In bacterial cells the DNA is present as a diffuse blob. Another way of describing a gene would be to call it a part of a chromosome, composed of a section of DNA which carries the genetic information to code for a particular protein. More about chromosomes. Humans have 46 chromosomes in every normal cell of the body. read more
A gene mutation is a permanent alteration in the DNA sequence that makes up a gene, such that the sequence differs from what is found in most people. read more