The hereditary information of an organism is located in its DNA (deoxyribonucleic acid). DNA is found within the nucleus of most cells, packaged into structures called chromosomes.

Here's a breakdown:

* DNA: This molecule contains the genetic instructions for building and maintaining an organism. It's like a blueprint for life.

* Nucleus: This is the control center of the cell where the DNA is housed.

* Chromosomes: These are thread-like structures made of DNA and proteins. They contain the organized genetic information of an organism.

So, the hereditary information, or genes, are found within the DNA located inside the nucleus of most cells, organized into chromosomes.