Chromosomes that look like chimney brushes or lamp brushes are called lamp brush chromosomes. These chromosomes have several pairs of loops centered on their axis and look like chimney brushes or lamp brushes. The axis of the chromosome is made up of chromomeres and inter-chromomeres and loops of transcribing DNA. Its length is 1500-2000 micrometers. It is required for the formation of mRNA and egg yolk. In 1882, the embryologist Flemming first discovered this chromosome from the egg of the amphibian salamander (Amblystoma maxicanum). It is found in oocytes or immature eggs of fish, amphibians, reptiles, birds and insects. However, it is not found in the ovum of mammals.