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All the cells in the body have the same mitochondrial DNA, which is inherited from the maternal side (egg cells have them, sperm cells don’t).

(Edit: except for cells that have no mitochondria, of course)

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Yes but do they differentiate across different cell types?

IANABiologist, but my understanding is that they don’t differentiate; they have too simplistic a structure for that, and rely on the host cells for many of their functions. The main differences seen across cell types is whether they are present or not.

My girlfriend is a biologist. She is saying that all cells that have mitochondrias in a human body have the same mitochondrial DNA.

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