- The genetic material in a eukaryotic cell is primarily contained within the nucleus.
- The nucleus serves as the control center of the cell, housing the cell’s DNA, which contains the instructions necessary for the development, function, and reproduction of the cell.

- While other organelles such as the mitochondria do contain small amounts of DNA, this is limited and primarily involved in coding for mitochondrial functions.
- Organelles like the endoplasmic reticulum and the Golgi apparatus are involved in protein and lipid synthesis and processing, but they do not contain genetic material.

Thus, the nucleus is the primary repository of genetic information in eukaryotic cells.

Reference: Molecular Biology of the Cell, 6th Edition, Chapter 3, Page 150