Here's a breakdown:

* Genes: These are the basic units of heredity, carrying the instructions for building and maintaining an organism. They are made up of DNA.

* Chromosomes: These are thread-like structures found in the nucleus of every cell. They are made up of tightly packed DNA and proteins.

* Location: Genes reside at specific locations on chromosomes, known as loci. Each gene has a unique locus, like an address on a chromosome.

Example:

* The gene for eye color is located on chromosome 15.

* The gene for cystic fibrosis is located on chromosome 7.

It's important to note that:

* Alleles: Each gene has two copies, one inherited from each parent. These copies are called alleles, and they may be the same or different. Different alleles can lead to variations in a trait.

* Dominant and Recessive: Some alleles are dominant, meaning they express their trait even if only one copy is present. Others are recessive, requiring two copies for their trait to be expressed.

Understanding how genes are organized on chromosomes is crucial for understanding inheritance patterns, genetic disorders, and many other aspects of biology.