Here's why:

* Mitochondria are organelles found within the cells of most eukaryotic organisms (plants, animals, fungi). They are responsible for cellular respiration, the process that generates energy for the cell.

* Mitochondrial DNA (mtDNA) is a small, circular molecule of DNA that resides within the mitochondria. It's distinct from the nuclear DNA found in the cell's nucleus.

* mtDNA is inherited maternally, meaning you receive it from your mother.

Other cellular components, like chloroplasts in plants, also have their own independent DNA.

Let me know if you'd like to know more about mitochondrial DNA!