Reproduction is the process of formation of new young ones of similar type by the grown up individual

DNA functions as blue print of life as it is a store house of all information . It acts as master copy. It produces working copies in the form of RNA. Prior to cell division DNA replicates (coping)to form two copies which remain attached in the form of two chromatids of a chromosome. But replication is not error proof. For this copies are not identical . Errors give variation. These variations are may be beneficial, neutral or harmful. If the variation is drastic then the daughter cell will die.