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Did you learn in school that mitochondria had its own DNA? And that our mitochondria comes from the egg, so mitochondrial DNA always comes from our mother's mitochondria.

Or even played Parasite Eve [0]

[0] https://en.wikipedia.org/wiki/Parasite_Eve_(video_game)#Plot

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Actually, yes. I recall that the high school textbook and lecture did talk about mitochondria having its own DNA and that mitochondria traced the maternal tree. Although those are somewhat interesting, its origin as a separate lifeform is WAY more interesting.

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