Genes in the nucleus are stored on structures called chromosomes , which are made of tightly coiled DNA wrapped around proteins called histones.

Where exactly are genes in a cell?

Inside a typical animal or plant cell:

  1. Nucleus
    • This is the “control center” of the cell and it houses most of the cell’s DNA.
 * The DNA in the nucleus is called **nuclear DNA**.
  1. Chromosomes
    • DNA in the nucleus is organized into long pieces called chromosomes.
 * Each chromosome is a single, very long DNA molecule plus histone proteins, all packed together.

 * A **gene** is just a specific segment of this DNA that carries instructions for a protein or RNA.
  1. Chromatin and nucleosomes
    • In most of the cell’s life, DNA is not seen as distinct X‑shaped chromosomes; instead it exists as chromatin : DNA plus histones, loosely or tightly packed.
 * Short stretches of DNA wrapped around histone protein “spools” form **nucleosomes** , which are the basic packaging units of chromatin.

 * Genes are found along this chromatin, so you can think of them as “addresses” along the chromatin fiber.
  1. Mitochondria (a small extra detail)
    • A small number of genes are not in the nucleus at all but in mitochondria , the cell’s energy‑producing organelles.
 * This is called **mitochondrial DNA (mtDNA)** , and it also carries genes, just many fewer than nuclear DNA.

Simple mental picture

If you imagine the cell as a city:

  • The nucleus is the main library building.
  • Inside the library, chromosomes are like long shelves of books.
  • Each gene is one “chapter” along a DNA “book,” sitting on those shelves.

So when you say “genes are in the nucleus,” you can be more precise:
They are specific stretches of DNA located on chromosomes (chromatin) inside the nucleus , with a small extra set of genes on DNA inside mitochondria.

Information gathered from public forums or data available on the internet and portrayed here.