The nucleus is primarily in charge of storing the cell's genetic material, or DNA
In terms of genomics, a nucleus is an organelle within a cell that is membrane-enclosed and houses the chromosomes.
The nuclear membrane has a variety of pores that enable the selective passage of specific molecules (such as proteins and nucleic acids) into and out of the nucleus.
The nucleus is located in the center of the cell and houses all of the cell's chromosomes.
A minor quantity of DNA can also be found in the mitochondria, although the majority of DNA is contained in the cell nucleus (where it is known as nuclear DNA) (where it is called mitochondrial DNA or mtDNA).