Where are genes located?

Explanation:

During cell division, a specialized structure is formed as a result of condensation of chromatin known as Chromosomes.

Genes are hereditary packets or units of information that are transmitted from one generation to another.

Genes are located on the DNA, and all organisms mostly contain DNA except viruses which have RNA as their genetic material.

We can understand by this explanation that the genes are located on chromosomes.

Final Answer:

Hence, the correct answer is option D: Chromosomes.