The nucleus

Robert Brown for the first time in 1833 discovered a prominent body within the cell and termed it nucleus. A synonymous term for this organelle is the Greek word karyon. The nucleus can be called as the controlling centre of the cell, since it contains the chromosomes and the genes, which control all activities of an individual cell. The chromosomes which are present within the nucleus are responsible for deciding whether a fertilized egg will develop into a cow, a mango tree or into a man.