The Nucleus is an organelle enclosed in a nuclear membrane present in all Eukaryotic. It controls the activities of the cell by regulating the expression of genes in the Deoxy ribosenucleic acid (DNA) stored in it. It controls the hereditary traits of an organism by regulating cell division.
It harbors the nucleolus, which contains the Ribosenucleic acid (RNA) that conveys the instructions in the DNA and also serves as a template for protein synthesis (responsible for phenotypic traits) in the ribosome.